{"id":4757,"date":"2026-10-19T11:36:25","date_gmt":"2026-10-19T08:36:25","guid":{"rendered":"https:\/\/support.withsecure.com\/?page_id=4757"},"modified":"2026-10-19T11:36:25","modified_gmt":"2026-10-19T08:36:25","slug":"countercept-agent-for-windows","status":"publish","type":"page","link":"https:\/\/support.withsecure.com\/en\/changelogs\/products\/countercept-agent-for-windows\/","title":{"rendered":"Countercept Agent for Windows"},"content":{"rendered":"<section\n    class=\"wp-block-support-banner edwp-block wp-block-support-banner--bg-light-gray layout--spacing-xxxl-top layout--spacing-xxxl-bottom\"\n    >\n            <div class=\"wp-block-support-banner__container\">\n        <div class=\"wp-block-support-banner__content-wrapper\">\n                        <div class=\"wp-component-content wp-component-content--default wp-block-support-banner__content\">\n            <h2 class=\"wp-component-heading text--h2 wp-component-content__title\">\n    Changelogs<\/h2>                    <div class=\"wp-component-content__inner\">\n                                    <div class=\"wp-component-content__content wysiwyg\">\n                        <div class=\"wp-component-paragraph \">\n    <h4>Countercept Agent for Windows<\/h4>\n<\/div>\n                    <\/div>\n                                                            <\/div>\n                <\/div>                            <div class=\"wp-block-support-banner__searchbar\">\n                    <div class=\"addsearch-standalone-searchbar-container\" data-addsearch-results-url=\"\/en\/search\"><\/div>\n                <\/div>\n                                <\/div>\n    <\/div>\n<\/section>\n\n\n<section\n    class=\"wp-block-content-list edwp-block layout--spacing-l-top layout--spacing-l-bottom\"\n    >\n    <div class=\"wp-block-content-list__container\">\n        \n        <div class=\"wp-block-content-list__main\">\n                    <ul class=\"wp-block-content-list__list\">\n            <li class=\"wp-block-content-list__item\">\n                            <time class=\"wp-block-content-list__updated\" datetime=\"2026-09-16T00:00:00+00:00\">September 16, 2026<\/time>\n            \n            <a class=\"wp-block-content-list__link\" href=\"https:\/\/support.withsecure.com\/en\/changelogs\/countercept-agent-for-windows-2026-09-16-ultralight-core-update\/\">\n                <p class=\"wp-block-content-list__title\">Countercept Agent for Windows &#8211; 2026-09-16 &#8211; Ultralight Core update<\/p>\n            <\/a>\n\n            \n                            <details class=\"wp-block-content-list__details\">\n                    <summary class=\"wp-block-content-list__summary\">Read more<\/summary>\n                    <div class=\"wp-component-paragraph wp-block-content-list__body\">\n    <p>The update is related to the Countercept Agent\u2019s Ultralight Core. Ultralight Core provides low-level functionality such as file hash calculation as part of the agent\u2019s reporting of endpoint activity.<\/p>\n<p>Product Name: Countercept Agent for Windows &#8211; Ultralight Core<\/p>\n<p>Version: 2.1.22462<\/p>\n<p>Pilot Availability: 17\/09\/2026<\/p>\n<p>General Availability: 24\/09\/2026<\/p>\n<p>Predecessor: 2.1.22416<\/p>\n<p>Release Purpose:<\/p>\n<ul>\n<li>General maintenance<\/li>\n<\/ul>\n<p>Customer Action Required:<\/p>\n<ul>\n<li>The Operating System should be Azure Code Signing (ACS) compliant to receive this update. See\u00a0<span class=\"js-embed embedResponsive inlineEmbed\"><br \/>\n    <a href=\"https:\/\/community.withsecure.com\/en\/kb\/articles\/29714-changes-in-support-on-microsoft-windows-minimum-patch-level\" rel=\"nofollow noopener ugc\" target=\"_blank\"><br \/>\n        https:\/\/community.withsecure.com\/en\/kb\/articles\/29714-changes-in-support-on-microsoft-windows-minimum-patch-level<br \/>\n    <\/a><br \/>\n<\/span><br \/>\n \u00a0\u00a0\u00a0\u00a0for more details.<br \/>\nAny endpoints which are not ACS-compliant will continue to run the older version of the Ultralight Core (2.1.16183).<\/li>\n<\/ul>\n<p>Name Changes:<\/p>\n<ul>\n<li>No changes to file, process, or service names.<\/li>\n<\/ul>\n<p>Files Updated:<\/p>\n<ul>\n<li>CapricornScanner.exe<\/li>\n<li>fshoster64.exe<\/li>\n<\/ul>\n<p>New Features and Enhancements:<\/p>\n<ul>\n<li>N\/A<\/li>\n<\/ul>\n<p>General Maintenance:<\/p>\n<ul>\n<li>General maintenance of functionality not utilized<br \/>&#13;<br \/>\nby Countercept<\/li>\n<\/ul>\n<p>OS Support:<\/p>\n<ul>\n<li>Windows 10, 11<\/li>\n<li>Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025<\/li>\n<\/ul>\n<\/div>\n                <\/details>\n                    <\/li>\n            <li class=\"wp-block-content-list__item\">\n                            <time class=\"wp-block-content-list__updated\" datetime=\"2026-09-11T00:00:00+00:00\">September 11, 2026<\/time>\n            \n            <a class=\"wp-block-content-list__link\" href=\"https:\/\/support.withsecure.com\/en\/changelogs\/countercept-agent-for-windows-2026-09-11-sensor-update\/\">\n                <p class=\"wp-block-content-list__title\">Countercept Agent for Windows &#8211; 2026-09-11 &#8211; Sensor update<\/p>\n            <\/a>\n\n            \n                            <details class=\"wp-block-content-list__details\">\n                    <summary class=\"wp-block-content-list__summary\">Read more<\/summary>\n                    <div class=\"wp-component-paragraph wp-block-content-list__body\">\n    <p>The update is related to the Countercept Agent\u2019s\u00a0Sensor component. The Sensor component gathers data to be analyzed in the WithSecure backend to identify any malicious activity.\u00a0<\/p>\n<p>Product Name: Countercept Agent for Windows \u2013 Sensor Component<\/p>\n<p>Version: 2026.3.49<\/p>\n<p>Pilot Availability: 14\/09\/2026<\/p>\n<p>General Availability: 21\/09\/2026<\/p>\n<p>Predecessor: 2026.3.43<\/p>\n<p>Release Purpose:<\/p>\n<ul>\n<li>Generic maintenance<\/li>\n<\/ul>\n<p>Customer Action Required:<\/p>\n<ul>\n<li>The Operating System should be Azure Code Signing (ACS) compliant to receive this update. See\u00a0<span class=\"js-embed embedResponsive inlineEmbed\"><br \/>\n    <a href=\"https:\/\/community.withsecure.com\/en\/kb\/articles\/29714-changes-in-support-on-microsoft-windows-minimum-patch-level\" rel=\"nofollow noopener ugc\" target=\"_blank\"><br \/>\n        https:\/\/community.withsecure.com\/en\/kb\/articles\/29714-changes-in-support-on-microsoft-windows-minimum-patch-level<br \/>\n    <\/a><br \/>\n<\/span><br \/>\n \u00a0\u00a0for more details.<\/li>\n<\/ul>\n<p>Name Changes:<\/p>\n<ul>\n<li>No changes to file, process, or service names.<\/li>\n<\/ul>\n<p>Files Updated:<\/p>\n<ul>\n<li>fsatp.sys<\/li>\n<li>fsatpl.exe<\/li>\n<li>fsatpn.exe<\/li>\n<li>install.exe<\/li>\n<li>sensor_control.exe<\/li>\n<\/ul>\n<p>New Features and Enhancements:<\/p>\n<ul>\n<li>N\/A<\/li>\n<\/ul>\n<p>General Maintenance:<\/p>\n<ul>\n<li>Security fixes and bug fixes<\/li>\n<\/ul>\n<p>OS Support:<\/p>\n<ul>\n<li>Windows 10, 11<\/li>\n<li>Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025<\/li>\n<\/ul>\n<\/div>\n                <\/details>\n                    <\/li>\n            <li class=\"wp-block-content-list__item\">\n                            <time class=\"wp-block-content-list__updated\" datetime=\"2026-09-09T00:00:00+00:00\">September 9, 2026<\/time>\n            \n            <a class=\"wp-block-content-list__link\" href=\"https:\/\/support.withsecure.com\/en\/changelogs\/countercept-agent-for-windows-2026-09-09-ultralight-core-update\/\">\n                <p class=\"wp-block-content-list__title\">Countercept Agent for Windows &#8211; 2026-09-09 &#8211; Ultralight Core update<\/p>\n            <\/a>\n\n            \n                            <details class=\"wp-block-content-list__details\">\n                    <summary class=\"wp-block-content-list__summary\">Read more<\/summary>\n                    <div class=\"wp-component-paragraph wp-block-content-list__body\">\n    <p>The update is related to the Countercept Agent\u2019s Ultralight Core. Ultralight Core provides low-level functionality such as file hash calculation as part of the agent\u2019s reporting of endpoint activity.<\/p>\n<p>Product Name: Countercept Agent for Windows &#8211; Ultralight Core<\/p>\n<p>Version: 2.1.22416<\/p>\n<p>Pilot Availability: 10\/09\/2026<\/p>\n<p>General Availability: 17\/09\/2026<\/p>\n<p>Predecessor: 2.1.22029<\/p>\n<p>Release Purpose:<\/p>\n<ul>\n<li>General maintenance<\/li>\n<\/ul>\n<p>Customer Action Required:<\/p>\n<ul>\n<li>The Operating System should be Azure Code Signing (ACS) compliant to receive this update. See\u00a0<span class=\"js-embed embedResponsive inlineEmbed\"><br \/>\n    <a href=\"https:\/\/community.withsecure.com\/en\/kb\/articles\/29714-changes-in-support-on-microsoft-windows-minimum-patch-level\" rel=\"nofollow noopener ugc\" target=\"_blank\"><br \/>\n        https:\/\/community.withsecure.com\/en\/kb\/articles\/29714-changes-in-support-on-microsoft-windows-minimum-patch-level<br \/>\n    <\/a><br \/>\n<\/span><br \/>\n\u00a0\u00a0\u00a0\u00a0for more details.<br \/>\nAny endpoints which are not ACS-compliant will continue to run the older version of the Ultralight Core (2.1.16183).<\/li>\n<\/ul>\n<p>Name Changes:<\/p>\n<ul>\n<li>No changes to file, process, or service names.<\/li>\n<\/ul>\n<p>Files Updated:<\/p>\n<ul>\n<li>CapricornScanner.exe<\/li>\n<li>fsulgk.sys<\/li>\n<li>install.exe<\/li>\n<li>fshoster64.exe<\/li>\n<li>FsPisces.exe<\/li>\n<li>uninstall.exe<\/li>\n<\/ul>\n<p>New Features and Enhancements:<\/p>\n<ul>\n<li>N\/A<\/li>\n<\/ul>\n<p>General Maintenance:<\/p>\n<ul>\n<li>Vulnerability fixes and bug fixes<\/li>\n<\/ul>\n<p>OS Support:<\/p>\n<ul>\n<li>Windows 10, 11<\/li>\n<li>Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025<\/li>\n<\/ul>\n<\/div>\n                <\/details>\n                    <\/li>\n            <li class=\"wp-block-content-list__item\">\n                            <time class=\"wp-block-content-list__updated\" datetime=\"2026-08-31T00:00:00+00:00\">August 31, 2026<\/time>\n            \n            <a class=\"wp-block-content-list__link\" href=\"https:\/\/support.withsecure.com\/en\/changelogs\/countercept-agent-for-windows-2026-08-31-response-component-update\/\">\n                <p class=\"wp-block-content-list__title\">Countercept Agent for Windows &#8211; 2026-08-31 &#8211; Response component update<\/p>\n            <\/a>\n\n            \n                            <details class=\"wp-block-content-list__details\">\n                    <summary class=\"wp-block-content-list__summary\">Read more<\/summary>\n                    <div class=\"wp-component-paragraph wp-block-content-list__body\">\n    <p>The update is related to the response\u00a0component\u00a0of the Countercept Agent, which enables the Detection and Response Team to retrieve artefacts for analysis or\u00a0contain\u00a0any identified threats within the environment.<\/p>\n<p>Product Name: Countercept Agent for Windows &#8211; Response component<\/p>\n<p>Version:<\/p>\n<ul>\n<li>1.0.617.421<\/li>\n<\/ul>\n<p>Pilot Availability: 01\/09\/2026<\/p>\n<p>General Availability: 08\/09\/2026<\/p>\n<p>Predecessor:<\/p>\n<ul>\n<li>1.0.530.395<\/li>\n<\/ul>\n<p>Release Purpose:<\/p>\n<ul>\n<li>General maintenance<\/li>\n<\/ul>\n<p>Customer Action Required:<\/p>\n<ul>\n<li>N\/A<\/li>\n<\/ul>\n<p>Name Changes:<\/p>\n<ul>\n<li>No changes to file, process, or service names.<\/li>\n<\/ul>\n<p>Files Updated:<\/p>\n<ul>\n<li>install.exe<\/li>\n<\/ul>\n<p>New Features and Enhancements:<\/p>\n<ul>\n<li>N\/A<\/li>\n<\/ul>\n<p>General Maintenance:<\/p>\n<ul>\n<li>Bug fixes<\/li>\n<\/ul>\n<p>OS Support:<\/p>\n<ul>\n<li>Windows 10, 11<\/li>\n<li>Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025<\/li>\n<\/ul>\n<\/div>\n                <\/details>\n                    <\/li>\n            <li class=\"wp-block-content-list__item\">\n                            <time class=\"wp-block-content-list__updated\" datetime=\"2026-07-24T00:00:00+00:00\">July 24, 2026<\/time>\n            \n            <a class=\"wp-block-content-list__link\" href=\"https:\/\/support.withsecure.com\/en\/changelogs\/countercept-agent-for-windows-2026-07-24-sensor-update\/\">\n                <p class=\"wp-block-content-list__title\">Countercept Agent for Windows &#8211; 2026-07-24 &#8211; Sensor update<\/p>\n            <\/a>\n\n            \n                            <details class=\"wp-block-content-list__details\">\n                    <summary class=\"wp-block-content-list__summary\">Read more<\/summary>\n                    <div class=\"wp-component-paragraph wp-block-content-list__body\">\n    <p>The update is related to the Countercept Agent\u2019s\u00a0Sensor component. The Sensor component gathers data to be analyzed in the WithSecure backend to identify any malicious activity.\u00a0<\/p>\n<p>Product Name: Countercept Agent for Windows \u2013 Sensor Component<\/p>\n<p>Version: 2026.3.43<\/p>\n<p>Pilot Availability: 27\/07\/2026<\/p>\n<p>General Availability: 10\/08\/2026<\/p>\n<p>Predecessor: 2026.2.37<\/p>\n<p>Release Purpose:<\/p>\n<ul>\n<li>New Features and Enhancements<\/li>\n<li>Generic maintenance<\/li>\n<\/ul>\n<p>Customer Action Required:<\/p>\n<ul>\n<li>The Operating System should be Azure Code Signing (ACS) compliant to receive this update. See\u00a0<span class=\"js-embed embedResponsive inlineEmbed\"><br \/>\n    <a href=\"https:\/\/community.withsecure.com\/en\/kb\/articles\/29714-changes-in-support-on-microsoft-windows-minimum-patch-level\" rel=\"nofollow noopener ugc\" target=\"_blank\"><br \/>\n        https:\/\/community.withsecure.com\/en\/kb\/articles\/29714-changes-in-support-on-microsoft-windows-minimum-patch-level<br \/>\n    <\/a><br \/>\n<\/span><br \/>\n\u00a0\u00a0for more details.<\/li>\n<\/ul>\n<p>Name Changes:<\/p>\n<ul>\n<li>No changes to file, process, or service names.<\/li>\n<\/ul>\n<p>Files Updated:<\/p>\n<ul>\n<li>fsatp.sys<\/li>\n<li>fsatpl.exe<\/li>\n<li>fsatpn.exe<\/li>\n<li>install.exe<\/li>\n<li>sensor_control.exe<\/li>\n<\/ul>\n<p>New Features and Enhancements:<\/p>\n<ul>\n<li>New detections<\/li>\n<li>Added support for Microsoft&#8217;s Driver Package Isolation<\/li>\n<\/ul>\n<p>General Maintenance:<\/p>\n<ul>\n<li>Bug fixes, security fixes and dependency updates<\/li>\n<\/ul>\n<p>OS Support:<\/p>\n<ul>\n<li>Windows 10, 11<\/li>\n<li>Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025<\/li>\n<\/ul>\n<\/div>\n                <\/details>\n                    <\/li>\n            <li class=\"wp-block-content-list__item\">\n                            <time class=\"wp-block-content-list__updated\" datetime=\"2026-07-13T00:00:00+00:00\">July 13, 2026<\/time>\n            \n            <a class=\"wp-block-content-list__link\" href=\"https:\/\/support.withsecure.com\/en\/changelogs\/countercept-agent-for-windows-2026-07-13-security-cloud-core-update\/\">\n                <p class=\"wp-block-content-list__title\">Countercept Agent for Windows &#8211; 2026-07-13 &#8211; Security Cloud Core update<\/p>\n            <\/a>\n\n            \n                            <details class=\"wp-block-content-list__details\">\n                    <summary class=\"wp-block-content-list__summary\">Read more<\/summary>\n                    <div class=\"wp-component-paragraph wp-block-content-list__body\">\n    <p>The update is related to the Countercept Agent\u2019s Security Cloud Core component. The Security Cloud Core component provides means for accessing WithSecure\u2019s Security Cloud functionalities utilized by the agent\u2019s detection components.<\/p>\n<p>Product Name: Countercept Agent for Windows &#8211; Security Cloud Core<\/p>\n<p>Version: 2.1.22151<\/p>\n<p>Pilot Availability: 14\/07\/2026<\/p>\n<p>General Availability: 21\/07\/2026<\/p>\n<p>Predecessor: 2.1.21903<\/p>\n<p>Release Purpose:<\/p>\n<ul>\n<li>General maintenance<\/li>\n<\/ul>\n<p>Customer Action Required:<\/p>\n<ul>\n<li>N\/A<\/li>\n<\/ul>\n<p>Name Changes:<\/p>\n<ul>\n<li>No changes to file, process, or service names.<\/li>\n<\/ul>\n<p>Files Updated:<\/p>\n<ul>\n<li>install.exe<\/li>\n<\/ul>\n<p>New Features and Enhancements:<\/p>\n<ul>\n<li>N\/A<\/li>\n<\/ul>\n<p>General Maintenance:<\/p>\n<ul>\n<li>Updates to third-party libraries and vulnerability fixes.<\/li>\n<\/ul>\n<p>OS Support:<\/p>\n<ul>\n<li>Windows 10, 11<\/li>\n<li>Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025<\/li>\n<\/ul>\n<\/div>\n                <\/details>\n                    <\/li>\n            <li class=\"wp-block-content-list__item\">\n                            <time class=\"wp-block-content-list__updated\" datetime=\"2026-06-25T00:00:00+00:00\">June 25, 2026<\/time>\n            \n            <a class=\"wp-block-content-list__link\" href=\"https:\/\/support.withsecure.com\/en\/changelogs\/countercept-agent-for-windows-2026-06-25-ultralight-updater-update\/\">\n                <p class=\"wp-block-content-list__title\">Countercept Agent for Windows &#8211; 2026-06-25 &#8211; Ultralight Updater update<\/p>\n            <\/a>\n\n            \n                            <details class=\"wp-block-content-list__details\">\n                    <summary class=\"wp-block-content-list__summary\">Read more<\/summary>\n                    <div class=\"wp-component-paragraph wp-block-content-list__body\">\n    <p>The update is related to the Countercept Agent\u2019s Ultralight Updater. Ultralight Core provides low-level functionality such as file hash calculation as part of the agent\u2019s reporting of endpoint activity.<\/p>\n<p>Product Name: Countercept Agent for Windows &#8211; Ultralight Updater<\/p>\n<p>Version: 2.1.22067<\/p>\n<p>Pilot Availability: 29\/06\/2026<\/p>\n<p>General Availability: 07\/07\/2026<\/p>\n<p>Predecessor: 2.1.20910<\/p>\n<p>Release Purpose:<\/p>\n<ul>\n<li>General maintenance<\/li>\n<\/ul>\n<p>Customer Action Required:<\/p>\n<ul>\n<li>N\/A<\/li>\n<\/ul>\n<p>Name Changes:<\/p>\n<ul>\n<li>No changes to file, process, or service names.<\/li>\n<\/ul>\n<p>Files Updated:<\/p>\n<ul>\n<li>install.exe\u00a0<\/li>\n<li>ulu.exe\u00a0<\/li>\n<li>ulu_handler.exe\u00a0<\/li>\n<li>ulu_handler_ns.exe\u00a0<\/li>\n<\/ul>\n<p>New Features and Enhancements:<\/p>\n<ul>\n<li>N\/A<\/li>\n<\/ul>\n<p>General Maintenance:<\/p>\n<ul>\n<li>General maintenance of functionality not utilized by Countercept.<\/li>\n<\/ul>\n<p>OS Support:<\/p>\n<ul>\n<li>Windows 10, 11<\/li>\n<li>Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025<\/li>\n<\/ul>\n<\/div>\n                <\/details>\n                    <\/li>\n            <li class=\"wp-block-content-list__item\">\n                            <time class=\"wp-block-content-list__updated\" datetime=\"2026-06-05T00:00:00+00:00\">June 5, 2026<\/time>\n            \n            <a class=\"wp-block-content-list__link\" href=\"https:\/\/support.withsecure.com\/en\/changelogs\/countercept-agent-for-windows-2026-06-05-response-update\/\">\n                <p class=\"wp-block-content-list__title\">Countercept Agent for Windows &#8211; 2026-06-05 &#8211; Response update<\/p>\n            <\/a>\n\n            \n                            <details class=\"wp-block-content-list__details\">\n                    <summary class=\"wp-block-content-list__summary\">Read more<\/summary>\n                    <div class=\"wp-component-paragraph wp-block-content-list__body\">\n    <p>Update to previous release schedule<\/p>\n<p>The update to our Windows agent&#8217;s Response Engine (RE) and Common Response Actions Module (CRAM) planned for GA release on 15th of June 2026, has been postponed until <strong>Wednesday 17th of June 2026<\/strong>. <\/p>\n<p>The update is related to the Countercept Agent\u2019s Response Engine (RE) and Common Response Actions Module (CRAM) components. The Response Engine and Common Response Actions Module components of the Countercept Agent enable the Detection and Response Team to retrieve artefacts for analysis or contain any identified threats within the environment.\u00a0<\/p>\n<p>Product Name: Countercept Agent for Windows &#8211; CRAM and RE<\/p>\n<p>Version:<\/p>\n<ul>\n<li>Response Engine 3.3.5<\/li>\n<li>CRAM 3.50.42<\/li>\n<\/ul>\n<p>Pilot Availability: 08\/06\/2026<\/p>\n<p>General Availability: 17\/06\/2026<\/p>\n<p>Predecessor:<\/p>\n<ul>\n<li>Response Engine 3.3.3<\/li>\n<li>CRAM 3.30.35<\/li>\n<\/ul>\n<p>Release Purpose:<\/p>\n<ul>\n<li>General maintenance<\/li>\n<\/ul>\n<p>Customer Action Required:<\/p>\n<ul>\n<li>N\/A<\/li>\n<\/ul>\n<p>Name Changes:<\/p>\n<ul>\n<li>No changes to file, process, or service names.<\/li>\n<\/ul>\n<p>Files Updated:<\/p>\n<ul>\n<li>ffind.exe<\/li>\n<li>fls.exe<\/li>\n<li>fscram-response.exe<\/li>\n<li>icat.exe<\/li>\n<li>ifind.exe<\/li>\n<li>install.exe<\/li>\n<li>mmcat.exe<\/li>\n<li>mmls.exe<\/li>\n<li>mmstat.exe<\/li>\n<li>verify.exe<\/li>\n<li>winpmem_1.6.2.exe<\/li>\n<li>winpmem_2.1.post4.exe<\/li>\n<li>winpmem_mini_x64_rc2.exe<\/li>\n<\/ul>\n<p>New Features and Enhancements:<\/p>\n<ul>\n<li>N\/A<\/li>\n<\/ul>\n<p>General Maintenance:<\/p>\n<ul>\n<li>Updates to third-party libraries and vulnerability fixes<\/li>\n<\/ul>\n<p>OS Support:<\/p>\n<ul>\n<li>Windows 10, 11<\/li>\n<li>Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025<\/li>\n<\/ul>\n<\/div>\n                <\/details>\n                    <\/li>\n            <li class=\"wp-block-content-list__item\">\n                            <time class=\"wp-block-content-list__updated\" datetime=\"2026-05-29T00:00:00+00:00\">May 29, 2026<\/time>\n            \n            <a class=\"wp-block-content-list__link\" href=\"https:\/\/support.withsecure.com\/en\/changelogs\/countercept-agent-for-windows-2026-05-29-ultralight-core-update\/\">\n                <p class=\"wp-block-content-list__title\">Countercept Agent for Windows &#8211; 2026-05-29 &#8211; Ultralight Core update<\/p>\n            <\/a>\n\n            \n                            <details class=\"wp-block-content-list__details\">\n                    <summary class=\"wp-block-content-list__summary\">Read more<\/summary>\n                    <div class=\"wp-component-paragraph wp-block-content-list__body\">\n    <p>Update to previous release schedule and version<\/p>\n<p>\u00a0<\/p>\n<p>Windows agent&#8217;s Ultralight Core release planned for General Available\u00a0release on Monday, 8th of June 2026, has been cancelled due to an issue found during the Pilot phase. We apologize for the delays related to this particular release, but we are committed to making sure that we release content with the highest possible quality.\u00a0<\/p>\n<p>\u00a0<\/p>\n<p>A new version of Ultralight Core (2.1.22029) that fixes the issue\u00a0found will be delivered to Pilot group endpoints on Monday, the 8th of June 2026, with a General Availability (GA) release on Monday, the 15th of June 2026.<\/p>\n<p>The update is related to the Countercept Agent\u2019s Ultralight Core. Ultralight Core provides low-level functionality such as file hash calculation as part of the agent\u2019s reporting of endpoint activity.<\/p>\n<p>Product Name: Countercept Agent for Windows &#8211; Ultralight Core<\/p>\n<p>Version: <s>2.1.21987<\/s> \/ 2.1.22029<\/p>\n<p>Pilot Availability: <s>01\/06\/2026<\/s> \/ 08\/06\/2026<\/p>\n<p>General Availability: <s>08\/06\/2026<\/s> \/ 15\/06\/2026<\/p>\n<p>Predecessor: 2.1.21833<\/p>\n<p>Release Purpose:<\/p>\n<ul>\n<li>General maintenance<\/li>\n<\/ul>\n<p>Customer Action Required:<\/p>\n<ul>\n<li>The Operating System should be Azure Code Signing (ACS) compliant to receive this update. See\u00a0<span class=\"js-embed embedResponsive inlineEmbed\"><br \/>\n    <a href=\"https:\/\/community.withsecure.com\/en\/kb\/articles\/29714-changes-in-support-on-microsoft-windows-minimum-patch-level\" rel=\"nofollow noopener ugc\" target=\"_blank\"><br \/>\n        https:\/\/community.withsecure.com\/en\/kb\/articles\/29714-changes-in-support-on-microsoft-windows-minimum-patch-level<br \/>\n    <\/a><br \/>\n<\/span><br \/>\n\u00a0\u00a0\u00a0\u00a0for more details.<br \/>\nAny endpoints which are not ACS-compliant will continue to run the older version of the Ultralight Core (2.1.16183).<\/li>\n<\/ul>\n<p>Name Changes:<\/p>\n<ul>\n<li>No changes to file, process, or service names.<\/li>\n<\/ul>\n<p>Files Updated:<\/p>\n<ul>\n<li>fshoster64.exe<\/li>\n<li>FsPisces.exe<\/li>\n<\/ul>\n<p>New Features and Enhancements:<\/p>\n<ul>\n<li>N\/A<\/li>\n<\/ul>\n<p>General Maintenance:<\/p>\n<ul>\n<li>General maintenance of functionality not utilized by Countercept.<\/li>\n<\/ul>\n<p>OS Support:<\/p>\n<ul>\n<li>Windows 10, 11<\/li>\n<li>Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025<\/li>\n<\/ul>\n<\/div>\n                <\/details>\n                    <\/li>\n            <li class=\"wp-block-content-list__item\">\n                            <time class=\"wp-block-content-list__updated\" datetime=\"2026-05-08T00:00:00+00:00\">May 8, 2026<\/time>\n            \n            <a class=\"wp-block-content-list__link\" href=\"https:\/\/support.withsecure.com\/en\/changelogs\/countercept-agent-for-windows-2026-05-08-security-cloud-core-update\/\">\n                <p class=\"wp-block-content-list__title\">Countercept Agent for Windows &#8211; 2026-05-08 &#8211; Security Cloud Core update<\/p>\n            <\/a>\n\n            \n                            <details class=\"wp-block-content-list__details\">\n                    <summary class=\"wp-block-content-list__summary\">Read more<\/summary>\n                    <div class=\"wp-component-paragraph wp-block-content-list__body\">\n    <p>The update is related to the Countercept Agent\u2019s Security Cloud Core component. The Security Cloud Core component provides means for accessing WithSecure\u2019s Security Cloud functionalities utilized by the agent\u2019s detection components.<\/p>\n<p>Product Name: Countercept Agent for Windows &#8211; Security Cloud Core<\/p>\n<p>Version: 2.1.21903<\/p>\n<p>Pilot Availability: 11\/05\/2026<\/p>\n<p>General Availability: 18\/05\/2026<\/p>\n<p>Predecessor: 2.1.21205<\/p>\n<p>Release Purpose:<\/p>\n<ul>\n<li>General maintenance<\/li>\n<\/ul>\n<p>Customer Action Required:<\/p>\n<ul>\n<li>N\/A<\/li>\n<\/ul>\n<p>Name Changes:<\/p>\n<ul>\n<li>No changes to file, process, or service names.<\/li>\n<\/ul>\n<p>Files Updated:<\/p>\n<ul>\n<li>install.exe<\/li>\n<\/ul>\n<p>New Features and Enhancements:<\/p>\n<ul>\n<li>N\/A<\/li>\n<\/ul>\n<p>General Maintenance:<\/p>\n<ul>\n<li>Updates to third-party libraries and vulnerability fixes.<\/li>\n<\/ul>\n<p>OS Support:<\/p>\n<ul>\n<li>Windows 10, 11<\/li>\n<li>Windows Server 2012, 2012 R2, 2016, 2019, 2022, 2025<\/li>\n<\/ul>\n<\/div>\n                <\/details>\n                    <\/li>\n    <\/ul>\n\n                            <nav class=\"wp-block-content-list__pagination\" aria-label=\"Pagination\">\n                    \n                                                                        <span class=\"wp-block-content-list__pagination-link wp-block-content-list__pagination-link--current\" aria-current=\"page\">1<\/span>\n                                                                                                <a class=\"wp-block-content-list__pagination-link\" href=\"\/en\/wp-json\/wp\/v2\/pages\/4757?cl_page=2\">2<\/a>\n                                                                                                <a class=\"wp-block-content-list__pagination-link\" href=\"\/en\/wp-json\/wp\/v2\/pages\/4757?cl_page=3\">3<\/a>\n                                                                                                <a class=\"wp-block-content-list__pagination-link\" href=\"\/en\/wp-json\/wp\/v2\/pages\/4757?cl_page=4\">4<\/a>\n                                                                                                <a class=\"wp-block-content-list__pagination-link\" href=\"\/en\/wp-json\/wp\/v2\/pages\/4757?cl_page=5\">5<\/a>\n                                            \n                                            <a class=\"wp-block-content-list__pagination-link\" href=\"\/en\/wp-json\/wp\/v2\/pages\/4757?cl_page=2\" rel=\"next\">Next<\/a>\n                                    <\/nav>\n                            <\/div>\n    <\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":0,"featured_media":0,"parent":4744,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-4757","page","type-page","status-publish","hentry"],"acf":[],"_links":{"self":[{"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/pages\/4757","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/types\/page"}],"replies":[{"embeddable":true,"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/comments?post=4757"}],"version-history":[{"count":1,"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/pages\/4757\/revisions"}],"predecessor-version":[{"id":8126,"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/pages\/4757\/revisions\/8126"}],"up":[{"embeddable":true,"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/pages\/4744"}],"wp:attachment":[{"href":"https:\/\/support.withsecure.com\/en\/wp-json\/wp\/v2\/media?parent=4757"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}