CVE-2021-31955

MEDIUM severity · CVSS 5.5 · CWE-497 · actively exploited (CISA KEV)

5.5CVSS MEDIUM ● exploited

🔴 Actively exploited in the wild (CISA Known Exploited Vulnerabilities). Added to KEV 2021-11-03. US federal agencies must patch by 2021-11-17.

Summary

Windows Kernel Information Disclosure Vulnerability

Impact & exploitability

Attack vectorLocal

Attack complexityLow

Privileges requiredLow

User interactionNone

Confidentiality impactHigh

Integrity impactNone

Availability impactNone

Exploit probability (EPSS)4%

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products we track (1)

Windows Server 2019

Recommendation

This vulnerability is being actively exploited in the wild — patch affected products urgently. Open any affected product above for its exact safe version.

Official patch: https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31955 ↗

Additional information

NVD record
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31955Patch
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31955Patch
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31955