CVE-2021-31985
Microsoft Defender Remote Code Execution Vulnerability
Microsoft Defender Remote Code Execution Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Defender Remote Code Execution Vulnerability
Microsoft Defender Remote Code Execution Vulnerability
- Record
CVE-2021-31985- CVSS 3.1
- 7.8 High
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 - Updated
- 2026-11-02
EUVDEUVD-2021-18857
Microsoft Defender Remote Code Execution Vulnerability
- Record
EUVD-2021-18857- CVSS 3.1
- 7.8 High
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 - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-jjcr-9wm8-qgr3
Microsoft Defender Remote Code Execution Vulnerability
Microsoft Defender Remote Code Execution Vulnerability
- Record
GHSA-jjcr-9wm8-qgr3- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
NVD
Microsoft Defender Remote Code Execution Vulnerability
- Record
CVE-2021-31985- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-31985 is a high vulnerability (CVSS 7.8) in Microsoft Malware Protection Engine, published June 8, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 7.76%, the 94th percentile. No source names a fixed version.