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TI-2021-11942 Aliases CVE-2021-31955GHSA-4grg-84cr-6c2h

Windows Kernel Information Disclosure Vulnerability

Priority HIGH 82Exploited in the wildCWE-497Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-497.

Summary

Windows Kernel Information Disclosure Vulnerability

Why it matters now

Exploitation Active In CISA KEV since 2021-11-03CISA due date 2021-11-17
EPSS 0.81107 99th percentileScored 2026-11-07
Fix Fixed Windows 10 Version 1809 (Microsoft): 10.0.17763.1999Windows Server 2019 (Microsoft): 10.0.17763.1999+7 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Active
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftWindows 10 Version 180910.0.0 to before 10.0.17763.199910.0.17763.1999Patch availableCNA
MicrosoftWindows Server 201910.0.0 to before 10.0.17763.199910.0.17763.1999Patch availableCNA
MicrosoftWindows Server 2019 (Server Core installation)10.0.0 to before 10.0.17763.199910.0.17763.1999Patch availableCNA
MicrosoftWindows 10 Version 190910.0.0 to before 10.0.18363.162110.0.18363.1621Patch availableCNA
MicrosoftWindows 10 Version 21H110.0.0 to before 10.0.19043.105210.0.19043.1052Patch availableCNA
MicrosoftWindows 10 Version 200410.0.0 to before 10.0.19041.105210.0.19041.1052Patch availableCNA
MicrosoftWindows Server version 200410.0.0 to before 10.0.19041.105210.0.19041.1052Patch availableCNA
MicrosoftWindows 10 Version 20H210.0.0 to before 10.0.19042.105210.0.19042.1052Patch availableCNA
MicrosoftWindows Server version 20H210.0.0 to before 10.0.19042.105210.0.19042.1052Patch availableCNA
  • Windows 10 Version 1809 VendorMicrosoft Affected 10.0.0 to before 10.0.17763.1999 Fixed in 10.0.17763.1999 Patch available CNA
  • Windows Server 2019 VendorMicrosoft Affected 10.0.0 to before 10.0.17763.1999 Fixed in 10.0.17763.1999 Patch available CNA
  • Windows Server 2019 (Server Core installation) VendorMicrosoft Affected 10.0.0 to before 10.0.17763.1999 Fixed in 10.0.17763.1999 Patch available CNA
  • Windows 10 Version 1909 VendorMicrosoft Affected 10.0.0 to before 10.0.18363.1621 Fixed in 10.0.18363.1621 Patch available CNA
  • Windows 10 Version 21H1 VendorMicrosoft Affected 10.0.0 to before 10.0.19043.1052 Fixed in 10.0.19043.1052 Patch available CNA
  • Windows 10 Version 2004 VendorMicrosoft Affected 10.0.0 to before 10.0.19041.1052 Fixed in 10.0.19041.1052 Patch available CNA
  • Windows Server version 2004 VendorMicrosoft Affected 10.0.0 to before 10.0.19041.1052 Fixed in 10.0.19041.1052 Patch available CNA
  • Windows 10 Version 20H2 VendorMicrosoft Affected 10.0.0 to before 10.0.19042.1052 Fixed in 10.0.19042.1052 Patch available CNA
  • Windows Server version 20H2 VendorMicrosoft Affected 10.0.0 to before 10.0.19042.1052 Fixed in 10.0.19042.1052 Patch available CNA

CPE configurations NVD · 8

CPEVersionsRoleVendor
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*before 10.0.17763.1999VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:*before 10.0.18363.1621VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:*before 10.0.19041.1052VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:*before 10.0.19042.1052VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:*before 10.0.19043.1052VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:*before 10.0.19041.1052VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*before 10.0.17763.1999VulnerableMicrosoft
cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:*before 10.0.19042.1052VulnerableMicrosoft
  • cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:* Versions before 10.0.17763.1999 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:* Versions before 10.0.18363.1621 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:* Versions before 10.0.19041.1052 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:* Versions before 10.0.19042.1052 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:* Versions before 10.0.19043.1052 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:* Versions before 10.0.19041.1052 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* Versions before 10.0.17763.1999 Vulnerable ·Microsoft
  • cpe:2.3:o:microsoft:windows_server_20h2:*:*:*:*:*:*:*:* Versions before 10.0.19042.1052 Vulnerable ·Microsoft

Remediation

  • Fix · CNA Windows 10 Version 1809 (Microsoft) Fixed in 10.0.17763.1999
  • Fix · CNA Windows Server 2019 (Microsoft) Fixed in 10.0.17763.1999
  • Fix · CNA Windows Server 2019 (Server Core installation) (Microsoft) Fixed in 10.0.17763.1999
  • Fix · CNA Windows 10 Version 1909 (Microsoft) Fixed in 10.0.18363.1621
  • Fix · CNA Windows 10 Version 21H1 (Microsoft) Fixed in 10.0.19043.1052
  • Fix · CNA Windows 10 Version 2004 (Microsoft) Fixed in 10.0.19041.1052
  • Fix · CNA Windows Server version 2004 (Microsoft) Fixed in 10.0.19041.1052
  • Fix · CNA Windows 10 Version 20H2 (Microsoft) Fixed in 10.0.19042.1052
  • Fix · CNA Windows Server version 20H2 (Microsoft) Fixed in 10.0.19042.1052

Timeline

  1. 2021-11-03 Added to CISA KEV
  2. 2026-10-02 Threatist record created from CVE-2021-31955
  3. 2026-10-03 Alias added: GHSA-4grg-84cr-6c2h

References

Patch 1

  • TI-2026-26194 Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-73128 Windows Shell Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2026-17367 MSHTML Framework Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2026-17364 Windows Shell Security Feature Bypass Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2025-24062 Windows SMB Client Elevation of Privilege Vulnerability KEVCVSS 3.1HIGH 8.8
  • TI-2025-24042 Internet Shortcut Files Remote Code Execution Vulnerability KEVCVSS 3.1HIGH 8.8
See all 4016 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences