CVE-2021-31985 json
Microsoft Defender Remote Code Execution Vulnerability
published 2021-06-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-18857
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 7.8%
- EPSS 7.8% chance of exploitation in 30 days, percentile 94%
- public exploits
- 0
- none known
Summary
Microsoft Defender Remote Code Execution Vulnerability
Patch / fix
- Microsoft Microsoft Malware Protection Engine Version 1.1.18200.3
Exploit prediction
7.76% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Affected products
- Microsoft Microsoft Malware Protection Engine
References
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-31985
patch, vendor-advisory
-
packetstormsecurity.com
/files/163443/MpEngine-ASProtect-Embedded-Runtime-DLL-Memory-Corruption.html
third-party-advisory, vdb-entry
Sources
- CVE List CVE-2021-31985
- NVD CVE-2021-31985
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.