CVE-2021-31955
Windows Kernel Information Disclosure Vulnerability
Windows Kernel Information Disclosure Vulnerability
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Windows Kernel Information Disclosure Vulnerability
Windows Kernel Information Disclosure Vulnerability
- Record
CVE-2021-31955- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C - Weakness
- CWE-497
- Updated
- 2026-11-02
EUVDEUVD-2021-18828
Windows Kernel Information Disclosure Vulnerability
- Record
EUVD-2021-18828- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:F/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-4grg-84cr-6c2h
Windows Kernel Information Disclosure Vulnerability
Windows Kernel Information Disclosure Vulnerability
- Record
GHSA-4grg-84cr-6c2h- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-200, CWE-497
- Updated
- 2026-11-02
CISA KEV No score
Microsoft Windows Kernel Information Disclosure Vulnerability
Microsoft Windows Kernel contains an unspecified vulnerability that allows for information disclosure. Successful exploitation allows attackers to read the contents of kernel memory from a user-mode process.
- Record
CVE-2021-31955- Weakness
- CWE-497
- Updated
- 2026-11-02
NVD
Windows Kernel Information Disclosure Vulnerability
- Record
CVE-2021-31955- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - CVSS 2.0
- 2.1 Low
AV:L/AC:L/Au:N/C:P/I:N/A:N - Weakness
- CWE-497
- Updated
- 2026-11-02
Affected products
- microsoft windows
- microsoft windows 10 version 1809
- microsoft windows 10 version 1909
- microsoft windows 10 version 2004
- microsoft windows 10 version 20h2
- microsoft windows 10 version 21h1
- microsoft windows server 2019
- microsoft windows server 2019 (server core installation)
- microsoft windows server version 2004
- microsoft windows server version 20h2
- microsoft windows 10 1809
- microsoft windows 10 1909
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | freeide/CVE-2021-31955-POC | 2021-06-26 |
| PoC in GitHub | ApexPredator-InfoSec/forti_shield | 2025-10-29 |
History
| Recorded | Changed | Sources |
|---|---|---|
| exploitation, exploits | ||
| first indexed | CVE List, EUVD, GitHub Advisories, CISA KEV, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-31955 is a medium vulnerability (CVSS 5.5) in Microsoft Windows, published June 8, 2021. CISA lists it as known to be exploited, since November 3, 2021. EUVD reports exploitation since November 3, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 81.1%, the 99th percentile. No source names a fixed version.