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CVE

CVE-2021-31955

Microsoft Windows Kernel Information Disclosure Vulnerability

Windows Kernel Information Disclosure Vulnerability.

MEDIUM · CVSS 5.5 ⚠ CISA KEV EPSS 0.03608
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
Sigma rules0 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

⬡

Weakness Classification

CWE-497Exposure of Sensitive System Information to an Unauthorized Control Sphere
▤

Affected Products & Versions

8
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
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Scoring & Timeline

5.5
MEDIUM · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD08 Jun 2021 · 11:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
cisaKEV-CVE-2021-31955
msrcCVE-2021-31955Information Disclosure
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31955PatchVendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31955US Government Resource
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