OnlyFm252
Capability Access Management Service (camsvc)

CVE-2026-21221 — Capability Access Management Service (camsvc) Elevation of Privilege Vulnerability

Important CVSS 7 EPSS 0.00219 2026-01 archive

Executive Summary

Concurrent execution using shared resource with improper synchronization ('race condition') in Capability Access Management Service (camsvc) allows an authorized attacker to elevate privileges locally.

Overview

7
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Exploitation Unlikely
MS Exploit Likelihood
Category Elevation of Privilege
Released Jan 13 2026
Last Updated Jan 13 2026
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.00219 — 0.12179 percentile
NVD CVSS 7 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.1

EPSS Score

0.00219
probability of exploitation in the next 30 days
0.12179 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

6 affected products
Product KB Article Severity Impact Restart Required
Windows 11 Version 24H2 for ARM64-based Systems 5074109 (Security Update) Important Elevation of Privilege Yes
Windows 11 Version 24H2 for x64-based Systems 5074109 (Security Update) Important Elevation of Privilege Yes
Windows 11 Version 25H2 for ARM64-based Systems 5074109 (Security Update) Important Elevation of Privilege Yes
Windows 11 Version 25H2 for x64-based Systems 5074109 (Security Update) Important Elevation of Privilege Yes
Windows Server 2025 5073379 (Security Update) Important Elevation of Privilege Yes
Windows Server 2025 (Server Core installation) 5073379 (Security Update) Important Elevation of Privilege Yes

Patches

2 patches
Article Type Restart
5074109 Security Update Yes
5073379 Security Update Yes

Known Exploits

Acknowledgments

k0shl

On This Page