[ CVE-2026-21525 · Published 10 Feb 2026 ]
Microsoft Windows NULL Pointer Dereference Vulnerability
Exploited · CISA KEV CVSS 6.2
EPSS 5%No fix listed yet
[ Why it matters ]Priority signals
- Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2026-02-10
[ Description ]Official description
Null pointer dereference in Windows Remote Access Connection Manager allows an unauthorized attacker to deny service locally.
CISA: Microsoft Windows Remote Access Connection Manager contains a NULL pointer dereference that could allow an unauthorized attacker to deny service locally.
[ Fixes ]Fixes and patches
CISA required action (US federal deadline 3 Mar 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.
No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.
[ References ]References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21525Vendor Advisory
- www.vicarius.io/vsociety/posts/cve-2026-21525-detection-script-dos-vulnerability-in-win…Third Party Advisory
- www.vicarius.io/vsociety/posts/cve-2026-21525-mitigation-script-dos-vulnerability-in-wi…MitigationThird Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource