Memory corruption in Microsoft Malware Protection Engine
Priority MEDIUM 63CWE-119Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on 32-bit versions of Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703 does not properly scan a specially crafted file leading to memory corruption. aka "Microsoft Malware Protection Engine Remote Code Execution Vulnerability".
Why it matters now
EPSS 0.43588 98th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
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 Malware Protection Engine | 32-bit versions only of Microsoft Forefront and Microsoft Defender on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016, Microsoft Exchange Server 2013 and 2016. | — | No fix listed | CNA |
- Microsoft Malware Protection Engine VendorMicrosoft Affected 32-bit versions only of Microsoft Forefront and Microsoft Defender on Microsoft Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016, Microsoft Exchange Server 2013 and 2016. Fixed in — No fix listed CNA
CPE configurations NVD · 13
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:windows_defender:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:x86:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1511:*:*:*:*:*:x86:* | 1511 | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:x86:* | 1607 | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1703:*:*:*:*:*:x86:* | 1703 | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:x86:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:x86:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x86:* | not specified by NVD | Running on | Microsoft |
| cpe:2.3:a:microsoft:endpoint_protection:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:forefront_endpoint_protection:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
- cpe:2.3:a:microsoft:windows_defender:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:x86:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1511:*:*:*:*:*:x86:* Versions 1511 Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:x86:* Versions 1607 Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1703:*:*:*:*:*:x86:* Versions 1703 Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:x86:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:x86:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x86:* Versions not specified by NVD Running on ·Microsoft
- cpe:2.3:a:microsoft:endpoint_protection:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:forefront_endpoint_protection:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
Show 3 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:microsoft:forefront_endpoint_protection:2010:*:*:*:*:*:*:* | 2010 | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:security_essentials:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:a:microsoft:windows_intune_endpoint_protection:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
- cpe:2.3:a:microsoft:forefront_endpoint_protection:2010:*:*:*:*:*:*:* Versions 2010 Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:security_essentials:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:a:microsoft:windows_intune_endpoint_protection:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2017-8558
- 2026-10-03 Alias added: GHSA-ghvf-8cx5-ch3h
References
More Microsoft Endpoint Protection vulnerabilities
- TI-2017-06074 Out-of-bounds write in Microsoft Malware Protection Engine KEVCVSS 3.1HIGH 7.8
- TI-2017-06071 Memory corruption in Microsoft Malware Protection Engine CVSS 3.1MEDIUM 5.5
- TI-2017-06070 Memory corruption in Microsoft Malware Protection Engine CVSS 3.1MEDIUM 5.5
- TI-2017-06069 Memory corruption in Microsoft Malware Protection Engine CVSS 3.1MEDIUM 5.5
- TI-2021-06388 Microsoft Defender Elevation of Privilege Vulnerability CVSS 3.1HIGH 7.8
Sources
- CVE-2017-8558 · CVE Program
- CVE-2017-8558 · NVD
- FIRST EPSS
- GHSA-ghvf-8cx5-ch3h · GitHub Advisory Database · CC BY 4.0
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