CVE-2021-31955: Windows Kernel Information Disclosure Vulnerability

Overview

Severity
Medium (CVSS 5.5)
CVSS Vector
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
Category
Information Disclosure
Exploit Status
Actively Exploited
Exploitation Likelihood
Detected
Patch Tuesday
2021-Jun
Released
2021-06-08
EPSS Score
4.83% (percentile: 89.5%)
CISA KEV
Listed — due 2021-11-17

FAQ

What type of information could be disclosed by this vulnerability? The type of information that could be disclosed if an attacker successfully exploited this vulnerability is the contents of Kernel memory. An attacker could read the contents of Kernel memory from a user mode process.

Known Exploits (2)

  • Microsoft Windows Kernel Information Disclosure Vulnerability — added 2025-10-29T18:16:29Z
  • Microsoft Windows Kernel Information Disclosure Vulnerability — added 2021-06-26T03:59:38Z

Detection & Weaponization (1 sources)

Maturity: Exploit

  • GitHub PoC: 2 repositories

Affected Products (18)

Windows

  • Windows 10 Version 1809 for 32-bit Systems
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1809 for ARM64-based Systems
  • Windows Server 2019
  • Windows Server 2019 (Server Core installation)
  • Windows 10 Version 1909 for 32-bit Systems
  • Windows 10 Version 1909 for x64-based Systems
  • Windows 10 Version 1909 for ARM64-based Systems
  • Windows 10 Version 21H1 for x64-based Systems
  • Windows 10 Version 21H1 for ARM64-based Systems
  • Windows 10 Version 21H1 for 32-bit Systems
  • Windows 10 Version 2004 for 32-bit Systems
  • Windows 10 Version 2004 for ARM64-based Systems
  • Windows 10 Version 2004 for x64-based Systems
  • Windows Server, version 2004 (Server Core installation)
  • Windows 10 Version 20H2 for 32-bit Systems
  • Windows 10 Version 20H2 for ARM64-based Systems
  • Windows Server, version 20H2 (Server Core Installation)

Security Updates (3)

Acknowledgments

Boris Larin (<a href="https://twitter.com/oct0xor">oct0xor</a>) of <a href="https://www.kaspersky.com/">Kaspersky Lab</a>

Revision History

  • 2021-06-08: Information published.