Oct 20, 2026 · 19:02 UTC SEARCH
UNRATED KNOWN EXPLOITED
Vulnerability intelligence

CVE-2026-21525

VendorMicrosoft
ProductWindows
Known exploitedYes
Added to CISA KEVFebruary 10, 2026
KEV due dateMarch 3, 2026
Known ransomware useNot identified by CISA

Microsoft Windows Remote Access Connection Manager contains a NULL pointer dereference that could allow an unauthorized attacker to deny service locally.

Required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

CISA KEV status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities Catalog. Known ransomware campaign use: Unknown.

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