Elevation of Privilege Vulnerability in Windows Ancillary Function Driver for WinSock
CVE-2025-32709

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Windows 10 Version 1809
Windows Server 2019
Windows Server 2019 (server Core Installation)
Windows Server 2022
Vendor
CVE Published:
13 May 2025

Badges

💰 Ransomware👾 Exploit Exists🦅 CISA Reported📰 News Worthy

What is CVE-2025-32709?

A vulnerability exists in the Windows Ancillary Function Driver for WinSock allowing an authorized attacker to exploit a use after free condition. This could enable the attacker to gain elevated privileges on the local system, potentially allowing them to execute arbitrary code with elevated rights. Given its nature, this vulnerability presents a significant security risk, highlighting the importance of keeping systems updated to mitigate exploitation.

CISA has reported CVE-2025-32709

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2025-32709 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace as recent news articles suggest the vulnerability is being used by ransomware groups.

The CISA's recommendation is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Affected Version(s)

Windows 10 Version 1507 32-bit Systems 10.0.10240.0 < 10.0.10240.21014

Windows 10 Version 1607 32-bit Systems 10.0.14393.0 < 10.0.14393.8066

Windows 10 Version 1809 32-bit Systems 10.0.17763.0 < 10.0.17763.7314

News Articles

favicon imageForbes

Windows Is Under Attack, Microsoft Confirms — Act Now, CISA Warns

Microsoft has confirmed multiple new Windows zero-day attacks. Here's what you need to know and do, right now.

3 weeks ago

favicon imageGBHackers News

Windows Ancillary for WinSock 0-Day Vulnerability Actively Exploited to Gain Admin Access.

Microsoft has confirmed active exploitation of a critical privilege escalation vulnerability in the Windows Ancillary Function Driver for WinSock.

4 weeks ago

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisory

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 💰

    Used in Ransomware

  • 📰

    First article discovered by GBHackers News

  • 👾

    Exploit known to exist

  • 🦅

    CISA Reported

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2025-32709 : Elevation of Privilege Vulnerability in Windows Ancillary Function Driver for WinSock