CVE-2025-21418 — Actively Exploited: Windows (Microsoft)
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.
| CVE ID | CVE-2025-21418 |
|---|---|
| Vendor | Microsoft |
| Product | Windows |
| Vulnerability name | Microsoft Windows Ancillary Function Driver for WinSock Heap-Based Buffer Overflow Vulnerability |
| Date added | 2025-02-11 |
| Remediation due | 2025-03-04 |
| Known ransomware use | Unknown |
| Required action | Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. |
| Description | 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. |
| Source | CISA Known Exploited Vulnerabilities |
🔍 Search all exploited vulnerabilities →
$1499/mo
Try ExploitWatch →