Home / Vulnerabilities / CVE-2025-21418
HIGH SEVERITY
CVE-2025-21418 Microsoft · Windows

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

Technical Severity

CVSS v3.1 Metrics

HIGH
7.8 / 10
Minimal Risk Critical
Vector Specification
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Exploitation Likelihood

EPSS Prediction

8.43 %
Predictive Probability
Percentile Rank
92.1 th

Documented as more likely to be exploited than 92.1% of known CVEs.

Detection Date

Feb 11, 2025

Remediation Due

Mar 04, 2025

CISA Catalog Active

Threat Analysis

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.

Remediation Directive

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

External Intelligence