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Fencer Vulns
high 7.8

CVE-2017-8558 in the critical feed json

The Microsoft Malware Protection Engine running on Microsoft Forefront and Microsoft Defender on 32-bit versions of Microsoft Windows Serve…

published 2017-06-29 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-17508

cvss
7.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
43.6%
EPSS 43.6% chance of exploitation in 30 days, percentile 98%
public exploits
1
Exploit-DB

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".

Timeline

  1. First public exploit (EDB-42264)
  2. Published

Exploit prediction

43.59% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-42264 Microsoft MsMpEng - mpengine x86 Emulator Heap Corruption in VFS API dos, 2017-06-27

CVSS scores

assigned by version score vector
NVD 3.0 7.8 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 9.3 AV:N/AC:M/Au:N/C:C/I:C/A:C

Affected products

  • Microsoft Corporation Microsoft Malware Protection Engine

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.