{"id":"CVE-2019-1255","aliases":["EUVD-2019-9821","GHSA-pr8x-gg94-wfq2"],"status":"published","title":"A denial of service vulnerability exists when Microsoft Defender improperly handles files, aka ...","description":"A denial of service vulnerability exists when Microsoft Defender improperly handles files, aka 'Microsoft Defender Denial of Service Vulnerability'.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.04145,"percentile":0.90924,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"published":"2019-09-23T19:14:38Z","modified":"2026-06-17T02:28:14Z","products":[{"vendor":"microsoft","product":"forefront_endpoint_protection_2010"},{"vendor":"microsoft","product":"microsoft forefront endpoint protection"},{"vendor":"microsoft","product":"microsoft security essentials"},{"vendor":"microsoft","product":"microsoft system center"},{"vendor":"microsoft","product":"security_essentials"},{"vendor":"microsoft","product":"system_center_endpoint_protection"},{"vendor":"microsoft","product":"windows defender on windows 10 for 32-bit systems"},{"vendor":"microsoft","product":"windows defender on windows 10 for x64-based systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1607 for 32-bit systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1607 for x64-based systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1703 for 32-bit systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1703 for x64-based systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1709 for 32-bit systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1709 for arm64-based systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1709 for x64-based systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1803 for 32-bit systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1803 for arm64-based systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1803 for x64-based systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1809 for 32-bit systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1809 for arm64-based systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1809 for x64-based systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1903 for 32-bit systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1903 for arm64-based systems"},{"vendor":"microsoft","product":"windows defender on windows 10 version 1903 for x64-based systems"},{"vendor":"microsoft","product":"windows defender on windows 7 for 32-bit systems"},{"vendor":"microsoft","product":"windows defender on windows 7 for x64-based systems"},{"vendor":"microsoft","product":"windows defender on windows 8.1 for 32-bit systems"},{"vendor":"microsoft","product":"windows defender on windows 8.1 for x64-based systems"},{"vendor":"microsoft","product":"windows defender on windows rt 8.1"},{"vendor":"microsoft","product":"windows defender on windows server 2008 for 32-bit systems"},{"vendor":"microsoft","product":"windows defender on windows server 2008 for 32-bit systems (server core installation)"},{"vendor":"microsoft","product":"windows defender on windows server 2008 for itanium-based systems"},{"vendor":"microsoft","product":"windows defender on windows server 2008 r2 for itanium-based systems"},{"vendor":"microsoft","product":"windows defender on windows server 2008 r2 for x64-based systems"},{"vendor":"microsoft","product":"windows defender on windows server 2008 r2 for x64-based systems (server core installation)"},{"vendor":"microsoft","product":"windows defender on windows server 2012"},{"vendor":"microsoft","product":"windows defender on windows server 2012 (server core installation)"},{"vendor":"microsoft","product":"windows defender on windows server 2012 r2"},{"vendor":"microsoft","product":"windows defender on windows server 2012 r2 (server core installation)"},{"vendor":"microsoft","product":"windows defender on windows server 2016"},{"vendor":"microsoft","product":"windows defender on windows server 2016  (server core installation)"},{"vendor":"microsoft","product":"windows defender on windows server 2019"},{"vendor":"microsoft","product":"windows defender on windows server 2019  (server core installation)"},{"vendor":"microsoft","product":"windows defender on windows server, version 1803  (server core installation)"},{"vendor":"microsoft","product":"windows defender on windows server, version 1903 (server core installation)"},{"vendor":"microsoft","product":"windows_defender"}],"references":[{"url":"https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1255","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-1255"},{"url":"https://github.com/advisories/GHSA-pr8x-gg94-wfq2"}],"sources":{"cve":[{"id":"CVE-2019-1255","description":"A denial of service vulnerability exists when Microsoft Defender improperly handles files, aka 'Microsoft Defender Denial of Service Vulnerability'.","status":"published","published":"2019-09-23T19:14:38Z","modified":"2024-08-04T18:13:29.704Z","updated_at":"2026-11-02T14:20:25.661187Z"}],"euvd":[{"id":"EUVD-2019-9821","description":"A denial of service vulnerability exists when Microsoft Defender improperly handles files, aka 'Microsoft Defender Denial of Service Vulnerability'.","status":"published","published":"2019-09-23T19:14:38Z","modified":"2024-08-04T18:13:29Z","updated_at":"2026-11-03T03:06:58.838317Z"}],"ghsa":[{"id":"GHSA-pr8x-gg94-wfq2","title":"A denial of service vulnerability exists when Microsoft Defender improperly handles files, aka ...","description":"A denial of service vulnerability exists when Microsoft Defender improperly handles files, aka 'Microsoft Defender Denial of Service Vulnerability'.","status":"published","published":"2022-05-24T16:56:40Z","modified":"2024-04-04T01:59:18Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T14:56:05.019773Z"}],"nvd":[{"id":"CVE-2019-1255","description":"A denial of service vulnerability exists when Microsoft Defender improperly handles files, aka 'Microsoft Defender Denial of Service Vulnerability'.","status":"published","published":"2019-09-23T20:15:13.18Z","modified":"2026-06-17T02:28:14.867Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"updated_at":"2026-11-02T14:05:28.126831Z"}]}}