Windows Remote Access Connection Manager
CVE-2026-21525 — Windows Remote Access Connection Manager Denial of Service Vulnerability
Executive Summary
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
Overview
6.2
CVSS MEDIUM
Moderate
MS Severity
Exploited
MS Exploit Status
Exploitation Detected
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
Temporal Score: 5.4
EPSS Score
0.04956
probability of exploitation in the next 30 days
0.91061 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
31 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 Version 1607 for 32-bit Systems | 5075999 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows 10 Version 1607 for x64-based Systems | 5075999 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 5075904 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows 10 Version 1809 for x64-based Systems | 5075904 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows 10 Version 21H2 for 32-bit Systems | 5075912 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows 10 Version 21H2 for ARM64-based Systems | 5075912 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows 10 Version 21H2 for x64-based Systems | 5075912 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows 10 Version 22H2 for 32-bit Systems | 5075912 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows 10 Version 22H2 for ARM64-based Systems | 5075912 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows 10 Version 22H2 for x64-based Systems | 5075912 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows 11 Version 23H2 for ARM64-based Systems | 5075941 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows 11 Version 23H2 for x64-based Systems | 5075941 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows 11 Version 24H2 for ARM64-based Systems | 5077181 (Security Update) 5077212 (Security Hotpatch Update) |
Moderate | Denial of Service | Yes |
| Windows 11 Version 24H2 for x64-based Systems | 5077212 (Security Hotpatch Update) 5077181 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows 11 Version 25H2 for ARM64-based Systems | 5077181 (Security Update) 5077212 (Security Hotpatch Update) |
Moderate | Denial of Service | Yes |
| Windows 11 Version 25H2 for x64-based Systems | 5077181 (Security Update) 5077212 (Security Hotpatch Update) |
Moderate | Denial of Service | Yes |
| Windows 11 Version 26H1 for ARM64-based Systems | 5077179 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows 11 version 26H1 for x64-based Systems | 5077179 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows Server 2012 | 5075971 (Monthly Rollup) |
Moderate | Denial of Service | Yes |
| Windows Server 2012 (Server Core installation) | 5075971 (Monthly Rollup) |
Moderate | Denial of Service | Yes |
| Windows Server 2012 R2 | 5075970 (Monthly Rollup) |
Moderate | Denial of Service | Yes |
| Windows Server 2012 R2 (Server Core installation) | 5075970 (Monthly Rollup) |
Moderate | Denial of Service | Yes |
| Windows Server 2016 | 5075999 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows Server 2016 (Server Core installation) | 5075999 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows Server 2019 | 5075904 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows Server 2019 (Server Core installation) | 5075904 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows Server 2022 | 5075906 (Security Update) 5075943 (Security Hotpatch Update) |
Moderate | Denial of Service | Yes |
| Windows Server 2022 (Server Core installation) | 5075906 (Security Update) 5075943 (Security Hotpatch Update) |
Moderate | Denial of Service | Yes |
| Windows Server 2022, 23H2 Edition (Server Core installation) | 5075897 (Security Update) |
Moderate | Denial of Service | Yes |
| Windows Server 2025 | 5075899 (Security Update) 5075942 (Security Hotpatch Update) |
Moderate | Denial of Service | Yes |
| Windows Server 2025 (Server Core installation) | 5075899 (Security Update) 5075942 (Security Hotpatch Update) |
Moderate | Denial of Service | Yes |
Patches
12 patches
| Article | Type | Restart |
|---|---|---|
5075999 |
Security Update | Yes |
5075904 |
Security Update | Yes |
5075912 |
Security Update | Yes |
5075941 |
Security Update | Yes |
5077181 (Security Update) 5077212 |
Security Update | Yes |
5077212 (Security Hotpatch Update) 5077181 |
Security Hotpatch Update | Yes |
5077179 |
Security Update | Yes |
5075971 |
Monthly Rollup | Yes |
5075970 |
Monthly Rollup | Yes |
5075906 (Security Update) 5075943 |
Security Update | Yes |
5075897 |
Security Update | Yes |
5075899 (Security Update) 5075942 |
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
0patch vulnerability research team with 0patch by ACROS Security
References
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