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CVE-2021-31955

MediumPublished

Windows Kernel Information Disclosure Vulnerability

Published: Jun 8, 2021
Updated: Oct 21, 2025
Assigning CNA: microsoft
Evidence observed: Nov 3, 2021

Primary CVSS

5.5/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS probability estimate

81.1%

High · next 30 days

Percentile: 99.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

Windows Kernel Information Disclosure Vulnerability

Sources

CVE-2021-31955-POCPoC
Proof-of-concept exploit for CVE-2021-31955, a Windows kernel information disclosure vulnerability. Demonstrates exploitation on 64-bit systems to leak sensitive kernel memory.
forti_shieldPoC
A combined POC for CVE-2021-31955, CVE-2015-4077, and CVE-2015-5736

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