CISA KEV · Known exploitedHigh

CVE-2025-32709

Microsoft Windows

Null pointer dereference in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVSS: 7.8
EPSS: 1.67%
CISA KEV: Listed
Published: 2025.05.14

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability1.67%

Technical severityCVSS 7.8

Vulnerability overview

Null pointer dereference in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Affected product and versions

Product: Microsoft Windows
Affected versions: 10.0.10240.0, 10.0.14393.0, 10.0.17763.0, 10.0.19044.0, 10.0.19045.0, 10.0.22621.0, 10.0.22631.0, 10.0.26100.0, 6.1.7601.0, 6.0.6003.0, 6.2.9200.0, 6.3.9600.0, 10.0.20348.0, 10.0.25398.0, < 10.0.10240.21014, < 10.0.14393.8066, < 10.0.17763.7314, < 10.0.19044.5854, < 10.0.19045.5854, < 10.0.22621.5335
Fixed versions: 10.0.10240.21014, 10.0.14393.8066, 10.0.17763.7314, 10.0.19044.5854, 10.0.19045.5854, 10.0.22621.5335, 10.0.22631.5335, 10.0.26100.3981, 10.0.20348.3692, 10.0.25398.1611

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Due date: 2025.06.03

1
Identify
Confirm that Microsoft Windows and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-416
KEV added: 2025.05.13
Ransomware use: 미확인