Microsoft Windows: 2 exploited vulnerabilities (CVE-2025-21391, CVE-2025-21418)
Microsoft Windows
CVE-2025-21391: Microsoft Windows Storage contains a link following vulnerability that could allow for privilege escalation. This vulnerability could allow an attacker to delete data including data that results in the service being unavailable. CVE-2025-21418: Microsoft Windows Ancillary Function Driver for WinSock contains a heap-based buffer overflow vulnerability that allows for privilege escalation, enabling a local attacker to gain SYSTEM privileges. Added to CISA KEV on 2025-02-11.
Why this severity: CVSS 7.8 (CNA, v3.1); actively exploited (CISA KEV)
- Started
- Feb 11, 2025
- Closed
- Feb 11, 2025
Affected
- See vendor advisory / CISA notes (versions not always listed in KEV feed)
Fixed in
- See vendor advisory linked in sources
Timeline2
CISA added CVE-2025-21391 to the KEV catalog (due 2025-03-04).
CISA added CVE-2025-21418 to the KEV catalog (due 2025-03-04).
Advisories5
Notes & caveats
Derived from CISA KEV JSON feed catalogVersion 2026.10.21. CVSS from the CVE record (cvelistV5). Exact affected/fixed version strings are not always in the KEV record; verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier; many entries are older CVEs newly confirmed as exploited in 2025).
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