What is CVE-2026-21525?

CVE-2026-21525 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Windows Remote Access Connection Manager Denial of Service Vulnerability

Which CVE IDs does CVE-2026-21525 cover?

CVE-2026-21525 covers the following CVE IDs: CVE-2026-21525. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-21525?

CVE-2026-21525 has a CVSS v3 base score of 6.2, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-21525?

CVE-2026-21525 affects 31 products, including: Windows 10 Version 1607 for 32-bit Systems; Windows 10 Version 1607 for x64-based Systems; Windows 10 Version 1809 for 32-bit Systems; Windows 10 Version 1809 for x64-based Systems; Windows 10 Version 21H2 for 32-bit Systems; and others — see the full list on the advisory page.

CVE-2026-21525MediumCVSS 6.2

Windows Remote Access Connection Manager Denial of Service Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

February 10, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-21525 →

📋 Description

Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.

🎯 Affected products31

Windows 10 Version 1607 for 32-bit Systems
Windows 10 Version 1607 for x64-based Systems
Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows 10 Version 21H2 for 32-bit Systems
Windows 10 Version 21H2 for ARM64-based Systems
Windows 10 Version 21H2 for x64-based Systems
Windows 10 Version 22H2 for 32-bit Systems
Windows 10 Version 22H2 for ARM64-based Systems
Windows 10 Version 22H2 for x64-based Systems
Windows 11 Version 23H2 for ARM64-based Systems
Windows 11 Version 23H2 for x64-based Systems
Windows 11 Version 24H2 for ARM64-based Systems
Windows 11 Version 24H2 for x64-based Systems
Windows 11 Version 25H2 for ARM64-based Systems
Windows 11 Version 25H2 for x64-based Systems
Windows 11 Version 26H1 for ARM64-based Systems
Windows 11 version 26H1 for x64-based Systems
Windows Server 2012
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2
Windows Server 2012 R2 (Server Core installation)
Windows Server 2016
Windows Server 2016 (Server Core installation)
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2022 (Server Core installation)
Windows Server 2022, 23H2 Edition (Server Core installation)
Windows Server 2025
+1 more not shown

✅ Remediation

KB5075904 (Security Update) — fixed build 10.0.17763.8389 KB5075906 (Security Update) — fixed build 10.0.20348.4773 KB5075943 (Security Hotpatch Update) — fixed build 10.0.20348.4711 KB5075912 (Security Update) — fixed build 10.0.19044.6937 KB5075912 (Security Update) — fixed build 10.0.19045.6937 KB5075899 (Security Update) — fixed build 10.0.26100.32370 KB5075942 (Security Hotpatch Update) — fixed build 10.0.26100.32313 KB5077181 (Security Update) — fixed build 10.0.26200.7840 KB5077212 (Security Hotpatch Update) — fixed build 10.0.26200.7781 KB5075941 (Security Update) — fixed build 10.0.22631.6649 KB5075897 (Security Update) — fixed build 10.0.25398.2149 KB5077181 (Security Update) — fixed build 10.0.26100.7840 KB5077212 (Security Hotpatch Update) — fixed build 10.0.26100.7781 KB5075999 (Security Update) — fixed build 10.0.14393.8868 KB5075971 (Monthly Rollup) — fixed build 6.2.9200.25923 KB5075970 (Monthly Rollup) — fixed build 6.3.9600.23022 KB5077179 (Security Update) — fixed build 10.0.28000.1575

🔗 CVE IDs covered (1)

📋 Description

🎯 Affected products31

✅ Remediation

🔗 References (29)