Windows Kernel
CVE-2021-31955 — Windows Kernel Information Disclosure Vulnerability
Executive Summary
None
Overview
5.5
CVSS MEDIUM
Important
MS Severity
Exploited
MS Exploit Status
Exploitation Detected
MS Exploit Likelihood
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:CATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
None
AVAILABILITY
None
EXPLOIT CODE MATURITY
Functional
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 5.1
EPSS Score
0.81107
probability of exploitation in the next 30 days
0.99599 percentile - updated 2026-08-14
View on FIRST.orgAffected Products
18 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 Version 1809 for 32-bit Systems | 5003646 (Security Update) | Important | Information Disclosure | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 5003646 (Security Update) | Important | Information Disclosure | Yes |
| Windows 10 Version 1809 for x64-based Systems | 5003646 (Security Update) | Important | Information Disclosure | Yes |
| Windows 10 Version 1909 for 32-bit Systems | 5003635 (Security Update) | Important | Information Disclosure | Yes |
| Windows 10 Version 1909 for ARM64-based Systems | 5003635 (Security Update) | Important | Information Disclosure | Yes |
| Windows 10 Version 1909 for x64-based Systems | 5003635 (Security Update) | Important | Information Disclosure | Yes |
| Windows 10 Version 2004 for 32-bit Systems | 5003637 (Security Update) | Important | Information Disclosure | Yes |
| Windows 10 Version 2004 for ARM64-based Systems | 5003637 (Security Update) | Important | Information Disclosure | Yes |
| Windows 10 Version 2004 for x64-based Systems | 5003637 (Security Update) | Important | Information Disclosure | Yes |
| Windows 10 Version 20H2 for 32-bit Systems | 5003637 (Security Update) | Important | Information Disclosure | Yes |
| Windows 10 Version 20H2 for ARM64-based Systems | 5003637 (Security Update) | Important | Information Disclosure | Yes |
| Windows 10 Version 21H1 for 32-bit Systems | 5003637 (Security Update) | Important | Information Disclosure | Yes |
| Windows 10 Version 21H1 for ARM64-based Systems | 5003637 (Security Update) | Important | Information Disclosure | Yes |
| Windows 10 Version 21H1 for x64-based Systems | 5003637 (Security Update) | Important | Information Disclosure | Yes |
| Windows Server 2019 | 5003646 (Security Update) | Important | Information Disclosure | Yes |
| Windows Server 2019 (Server Core installation) | 5003646 (Security Update) | Important | Information Disclosure | Yes |
| Windows Server, version 2004 (Server Core installation) | 5003637 (Security Update) | Important | Information Disclosure | Yes |
| Windows Server, version 20H2 (Server Core Installation) | 5003637 (Security Update) | Important | Information Disclosure | Yes |
Patches
3 patches
| Article | Type | Restart |
|---|---|---|
5003646 | Security Update | Yes |
5003635 | Security Update | Yes |
5003637 | Security Update | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Boris Larin ( oct0xor
References
On This Page