CVE-2026-21525
MEDIUM CISA KEV EPSS 91.1%
Published Feb 10, 20264mo ago · Modified Jun 17, 20261w ago
6.2 CVSS 3.1
Published Feb 10, 2026 4mo ago
Last Modified Jun 17, 2026 1w ago
KEV Listed Feb 10, 2026 4mo ago
KEV Due Mar 3, 2026 120d overdue
Description
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector Local
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High
Threat Intelligence
CISA Known Exploited Overdue 120d
- Added
- Feb 10, 2026
- Due
- Mar 3, 2026
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS Exploit Probability
91.1% percentile
Exploit & Patch Status
Actively Exploited (KEV)
No Patch Available
Weaknesses 1
CWE-476 NULL Pointer Dereference Memory Safety
Affected Products 23
| Vendor | Product | Version | Range |
|---|---|---|---|
| microsoft | windows_10_1607 | * | <10.0.14393.8868 |
| microsoft | windows_10_1607 | * | <10.0.14393.8868 |
| microsoft | windows_10_1809 | * | <10.0.17763.8389 |
| microsoft | windows_10_1809 | * | <10.0.17763.8389 |
| microsoft | windows_10_21h2 | * | <10.0.19044.6937 |
| microsoft | windows_10_21h2 | * | <10.0.19044.6937 |
| microsoft | windows_10_21h2 | * | <10.0.19044.6937 |
| microsoft | windows_10_22h2 | * | <10.0.19045.6937 |
| microsoft | windows_10_22h2 | * | <10.0.19045.6937 |
| microsoft | windows_10_22h2 | * | <10.0.19045.6937 |
| microsoft | windows_11_23h2 | * | <10.0.22631.6649 |
| microsoft | windows_11_23h2 | * | <10.0.22631.6649 |
| microsoft | windows_11_24h2 | * | <10.0.26100.7781 |
| microsoft | windows_11_24h2 | * | <10.0.26100.7781 |
| microsoft | windows_11_25h2 | * | <10.0.26200.7781 |
| microsoft | windows_11_25h2 | * | <10.0.26200.7781 |
| microsoft | windows_server_2012 | * | any |
| microsoft | windows_server_2012 | r2 | any |
| microsoft | windows_server_2016 | * | <10.0.14393.8868 |
| microsoft | windows_server_2019 | * | <10.0.17763.8389 |
| microsoft | windows_server_2022 | * | <10.0.20348.4711 |
| microsoft | windows_server_2022_23h2 | * | <10.0.25398.2149 |
| microsoft | windows_server_2025 | * | <10.0.26100.32313 |
References 4
- msrc.microsoft.com https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525
- cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21525
- vicarius.io https://www.vicarius.io/vsociety/posts/cve-2026-21525-detection-script-dos-vulnerability-in-windows-remote-access-connection-manager
- vicarius.io https://www.vicarius.io/vsociety/posts/cve-2026-21525-mitigation-script-dos-vulnerability-in-windows-remote-access-connection-manager
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.