CVE-2021-42298 json
Microsoft Defender Remote Code Execution Vulnerability
published 2021-11-10 4 y ago modified 2026-08-19 2 mo ago also EUVD-2021-29273
- cvss
- 7.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 5.8%
- EPSS 5.8% chance of exploitation in 30 days, percentile 93%
- public exploits
- 0
- none known
Summary
Microsoft Defender Remote Code Execution Vulnerability
Patch / fix
- Microsoft Microsoft Malware Protection Engine 1.1.18700.3
Exploit prediction
5.85% chance of exploitation in the next 30 days, higher than 93% 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 |
| NVD | 2.0 | 9.3 | AV:N/AC:M/Au:N/C:C/I:C/A:C |
Affected products
- Microsoft Microsoft Malware Protection Engine
Classification
- Weakness
-
- CWE-94 Improper Control of Generation of Code
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2021-42298
vendor-advisory, patch
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2021-42298
mitigation, patch, vendor-advisory
Sources
- CVE List CVE-2021-42298
- NVD CVE-2021-42298
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.