⚠ Actively exploited
Added to CISA KEV on 2021-11-03. Federal agencies required to patch by 2021-11-17. Required action: Apply updates per vendor instructions..

CVE-2021-31955

CWE-497CWE-200 — Information Exposure10 documents9 sources
Severity
5.5MEDIUM
EPSS
4.8%
top 10.49%
CISA KEV
KEV
Added 2021-11-03
Due 2021-11-17
Exploit
Exploited in wild
Active exploitation observed
Affected products
16
Microsoft Windows 10 Version 1809Microsoft Windows 10 Version 1909Microsoft Windows 10 Version 2004+13 more
Timeline
PublishedJun 8
KEV addedNov 3
KEV dueNov 17
Latest updateMay 24
CISA Required Action: Apply updates per vendor instructions.

Description

Windows Kernel Information Disclosure Vulnerability

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:NExploitability: 1.8 | Impact: 3.6

Affected Packages15 packages

▶NVDmicrosoft/windows< 10.0.19041.1052+2
▶NVDmicrosoft/windows_10_1809< 10.0.17763.1999
▶NVDmicrosoft/windows_10_1909< 10.0.18363.1621
▶NVDmicrosoft/windows_10_2004< 10.0.19041.1052
▶NVDmicrosoft/windows_10_20h2< 10.0.19042.1052

Patches

Patch: portal.msrc.microsoft.com ↗Patch: portal.msrc.microsoft.com ↗

🔴Vulnerability Details

4
GHSA
GHSA-4grg-84cr-6c2h: Windows Kernel Information Disclosure Vulnerability↗2022-05-24
▶
Project0
The More You Know, The More You Know You Don’t Know - Project Zero↗2022-04-01
▶
CVEList
Windows Kernel Information Disclosure Vulnerability↗2021-06-08
▶
VulnCheck
Microsoft Windows Kernel Information Disclosure Vulnerability↗2021
▶

📋Vendor Advisories

2
CISA
Microsoft Windows Kernel Information Disclosure Vulnerability↗2021-11-03
▶
Microsoft
Windows Kernel Information Disclosure Vulnerability↗2021-06-08
▶

🕵️Threat Intelligence

1
Krebs
Microsoft Patches Six Zero-Day Security Holes↗2021-06-08
▶