A denial of service vulnerability exists when Microsoft Defender improperly handles…
Priority MEDIUM 40Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA.
Summary
A denial of service vulnerability exists when Microsoft Defender improperly handles files, aka 'Microsoft Defender Denial of Service Vulnerability'.
Why it matters now
EPSS 0.04145 90th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | Microsoft Security Essentials | all versions | — | No fix listed | CNA |
| Microsoft | Microsoft System Center | 2012 Endpoint Protection; Endpoint Protection; 2012 R2 Endpoint Protection | — | No fix listed | CNA |
| Microsoft | Microsoft Forefront Endpoint Protection | 2010 | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 7 for 32-bit Systems | Service Pack 1 | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 7 for x64-based Systems | Service Pack 1 | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server 2008 R2 for x64-based Systems (Server Core installation) | Service Pack 1 | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server 2008 R2 for Itanium-Based Systems | Service Pack 1 | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server 2008 R2 for x64-based Systems | Service Pack 1 | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server 2008 for 32-bit Systems (Server Core installation) | Service Pack 2 | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server 2012 | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server 2012 (Server Core installation) | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 8.1 for 32-bit systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 8.1 for x64-based systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server 2012 R2 | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows RT 8.1 | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server 2012 R2 (Server Core installation) | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 for 32-bit Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 for x64-based Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server 2016 | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1607 for 32-bit Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1607 for x64-based Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server 2016 (Server Core installation) | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1703 for 32-bit Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1703 for x64-based Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1709 for 32-bit Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1709 for x64-based Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1803 for 32-bit Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1803 for x64-based Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server, version 1803 (Server Core Installation) | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1803 for ARM64-based Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1809 for 32-bit Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1809 for x64-based Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1809 for ARM64-based Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server 2019 | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server 2019 (Server Core installation) | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1709 for ARM64-based Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1903 for 32-bit Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1903 for x64-based Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows 10 Version 1903 for ARM64-based Systems | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server, version 1903 (Server Core installation) | all versions | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server 2008 for Itanium-Based Systems | Service Pack 2 | — | No fix listed | CNA |
| Microsoft | Windows Defender on Windows Server 2008 for 32-bit Systems | Service Pack 2 | — | No fix listed | CNA |
- Microsoft Security Essentials VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Microsoft System Center VendorMicrosoft Affected 2012 Endpoint Protection; Endpoint Protection; 2012 R2 Endpoint Protection Fixed in — No fix listed CNA
- Microsoft Forefront Endpoint Protection VendorMicrosoft Affected 2010 Fixed in — No fix listed CNA
- Windows Defender on Windows 7 for 32-bit Systems VendorMicrosoft Affected Service Pack 1 Fixed in — No fix listed CNA
- Windows Defender on Windows 7 for x64-based Systems VendorMicrosoft Affected Service Pack 1 Fixed in — No fix listed CNA
- Windows Defender on Windows Server 2008 R2 for x64-based Systems (Server Core installation) VendorMicrosoft Affected Service Pack 1 Fixed in — No fix listed CNA
- Windows Defender on Windows Server 2008 R2 for Itanium-Based Systems VendorMicrosoft Affected Service Pack 1 Fixed in — No fix listed CNA
- Windows Defender on Windows Server 2008 R2 for x64-based Systems VendorMicrosoft Affected Service Pack 1 Fixed in — No fix listed CNA
- Windows Defender on Windows Server 2008 for 32-bit Systems (Server Core installation) VendorMicrosoft Affected Service Pack 2 Fixed in — No fix listed CNA
- Windows Defender on Windows Server 2012 VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows Server 2012 (Server Core installation) VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 8.1 for 32-bit systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 8.1 for x64-based systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows Server 2012 R2 VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows RT 8.1 VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows Server 2012 R2 (Server Core installation) VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 for 32-bit Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 for x64-based Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows Server 2016 VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1607 for 32-bit Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1607 for x64-based Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows Server 2016 (Server Core installation) VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1703 for 32-bit Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1703 for x64-based Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1709 for 32-bit Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1709 for x64-based Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1803 for 32-bit Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1803 for x64-based Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows Server, version 1803 (Server Core Installation) VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1803 for ARM64-based Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1809 for 32-bit Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1809 for x64-based Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1809 for ARM64-based Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows Server 2019 VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows Server 2019 (Server Core installation) VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1709 for ARM64-based Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1903 for 32-bit Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1903 for x64-based Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows 10 Version 1903 for ARM64-based Systems VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows Server, version 1903 (Server Core installation) VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
- Windows Defender on Windows Server 2008 for Itanium-Based Systems VendorMicrosoft Affected Service Pack 2 Fixed in — No fix listed CNA
- Windows Defender on Windows Server 2008 for 32-bit Systems VendorMicrosoft Affected Service Pack 2 Fixed in — No fix listed CNA
CPE configurations NVD · 25
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:windows_defender:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:* | 1607 | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1703:*:*:*:*:*:*:* | 1703 | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1709:*:*:*:*:*:*:* | 1709 | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1803:*:*:*:*:*:*:* | 1803 | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:* | 1809 | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1903:*:*:*:*:*:*:* | 1903 | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
- cpe:2.3:a:microsoft:windows_defender:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:* Versions 1607 Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1703:*:*:*:*:*:*:* Versions 1703 Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1709:*:*:*:*:*:*:* Versions 1709 Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1803:*:*:*:*:*:*:* Versions 1803 Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:* Versions 1809 Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1903:*:*:*:*:*:*:* Versions 1903 Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
Show 15 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:itanium:* | r2 sp1 | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* | r2 sp1 | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* | r2 | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2016:1803:*:*:*:*:*:*:* | 1803 | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2016:1903:*:*:*:*:*:*:* | 1903 | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:a:microsoft:forefront_endpoint_protection_2010:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:security_essentials:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:system_center_endpoint_protection:*:*:*:*:*:*:*:* | all versions | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:system_center_endpoint_protection:2012:-:*:*:*:*:*:* | 2012 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:system_center_endpoint_protection:2012:r2:*:*:*:*:*:* | 2012 r2 | Vulnerable | Microsoft |
- cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:itanium:* Versions r2 sp1 Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* Versions r2 sp1 Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* Versions r2 Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2016:1803:*:*:*:*:*:*:* Versions 1803 Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2016:1903:*:*:*:*:*:*:* Versions 1903 Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:a:microsoft:forefront_endpoint_protection_2010:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:security_essentials:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:system_center_endpoint_protection:*:*:*:*:*:*:*:* Versions all versions Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:system_center_endpoint_protection:2012:-:*:*:*:*:*:* Versions 2012 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:system_center_endpoint_protection:2012:r2:*:*:*:*:*:* Versions 2012 r2 Vulnerable ·Microsoft
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2019-1255
- 2026-10-03 Alias added: GHSA-pr8x-gg94-wfq2
More Microsoft Forefront Endpoint Protection 2010 vulnerabilities
- TI-2018-00915 Out-of-bounds write in Microsoft Windows Defender CVSS 3.1HIGH 8.8
- TI-2020-01134 Incorrect permission assignment in Microsoft Forefront Endpoint Protection CVSS 3.1HIGH 7.8
- TI-2020-01128 An elevation of privilege vulnerability exists in Windows Defender that leads arbitrary… CVSS 3.1HIGH 7.8
- TI-2011-00036 Microsoft Malware Protection Engine before 1.1.6603.0, as used in Microsoft Malicious… CVSS 2.0HIGH 7.2
- TI-2020-01420 An elevation of privilege vulnerability exists when the MpSigStub.exe for Defender allows… CVSS 3.1HIGH 7.1
- TI-2020-00971 An elevation of privilege vulnerability exists when the MpSigStub.exe for Defender allows… CVSS 3.1HIGH 7.1
Sources
- CVE-2019-1255 · CVE Program
- CVE-2019-1255 · NVD
- FIRST EPSS
- GHSA-pr8x-gg94-wfq2 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences