CriticalCVECISA — Known Exploited Vulnerabilities· 11 Feb 2025

CVE-2025-21418 — Microsoft Windows Ancillary Function Driver for WinSock Heap-Based Buffer Overflow Vulnerability

Severity: Critical · Kind: Vulnerability

Plain-English summary on the way

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From the source

Microsoft Windows. 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. Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Vulnerability facts

CVE: CVE-2025-21418
On CISA KEV since: 2025-02-11
Ransomware use: Unknown

Read the original advisory →← All threat intel

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Plain-English summaries are AI-generated and reviewed for tone, not technical accuracy. For incident response, always rely on the original source linked above.