CVE-2021-31955
MEDIUMCVSS 5.5/10Actively ExploitedEPSS 80.26%
Last modified
CVE-2021-31955 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. Windows Kernel Information Disclosure Vulnerability. CISA has confirmed active exploitation in the wild. EPSS estimates a 80.26% chance of exploitation in the next 30 days.
Description
Windows Kernel Information Disclosure Vulnerability
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Exploitation Status
This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 1809 | < 10.0.17763.1999 |
| Microsoft | Windows 10 1909 | < 10.0.18363.1621 |
| Microsoft | Windows 10 2004 | < 10.0.19041.1052 |
| Microsoft | Windows 10 20h2 | < 10.0.19042.1052 |
| Microsoft | Windows 10 21h1 | < 10.0.19043.1052 |
| Microsoft | Windows Server 2004 | < 10.0.19041.1052 |
| Microsoft | Windows Server 2019 | < 10.0.17763.1999 |
| Microsoft | Windows Server 20h2 | < 10.0.19042.1052 |
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31955Patch, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31955Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31955US Government Resource
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2021-31955?
Windows Kernel Information Disclosure Vulnerability
How severe is CVE-2021-31955?
CVE-2021-31955 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 80.26% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
How do I fix CVE-2021-31955?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-31955?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST