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Microsoft Windows Ancillary Function Driver for WinSock Heap-Based Buffer Overflow Vulnerability

Type: advisorySource: CISA Known Exploited VulnerabilitiesKnown exploited1 source record

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. CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Announced Group revision 1
Original source ↗

CVE-2025-21418

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: kev:CVE-2025-21418

Windows

Source reference: /product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record
Related CVEs
CVE-2025-21418

Source reference: /cveID

Publisher severity

No explicit severity was provided.

Event
#490 · Revision 1
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Publisher date
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