CVSS 3.1
6.2 mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-21525
Medium (6.2) in Microsoft Windows. In CISA KEV since 2026-02-10. EPSS 4.9% chance of exploitation in the next 30 days.
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
Severity
- EPSS
- 4.9% chance of exploitation in the next 30 days; higher than 92% of CVEs (scores of 2026-10-31)
- CISA KEV
- listed 2026-02-10, due 2026-03-03
- CWE
- CWE-476
- Published
- Modified
- Record from
- the NVD, synced
Affected
- microsoft:windows_10_1607
- microsoft:windows_10_1809
- microsoft:windows_10_21h2
- microsoft:windows_10_22h2
- microsoft:windows_11_23h2
- microsoft:windows_11_24h2
- microsoft:windows_11_25h2
- microsoft:windows_server_2012
- microsoft:windows_server_2016
- microsoft:windows_server_2019
- microsoft:windows_server_2022
- microsoft:windows_server_2022_23h2
- microsoft:windows_server_2025
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525
- https://www.vicarius.io/vsociety/posts/cve-2026-21525-detection-script-dos-vulnerability-in-windows-remote-access-connection-manager
- https://www.vicarius.io/vsociety/posts/cve-2026-21525-mitigation-script-dos-vulnerability-in-windows-remote-access-connection-manager
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21525