CVE-2026-21525
Actively exploited. CVE-2026-21525 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-02-10) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Microsoft Windows Remote Access Connection Manager contains a NULL pointer dereference that could allow an unauthorized attacker to deny service locally.
CSIRTS triage
- What
- A NULL pointer dereference could allow an unauthorized attacker to deny service locally.
- Who is affected
- Deployments of Microsoft Windows Remote Access Connection Manager.
- Urgency
- Remediation is urgent due to active exploitation and critical severity.
- Action
- Install the security update from Microsoft.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 91% of all EPSS-scored CVEs.
Advisory coverage (1)
- criticalexploitedCVE-2026-21525: Microsoft Windows NULL Pointer Dereference Vulnerabilitycisa-kev · 2026-02-10
External references
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