What is CVE-2025-32709?

CVE-2025-32709 is a vulnerability affecting Microsoft Windows 10 Version 1507, Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008.... Null pointer dereference in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2025-32709 affects Microsoft Windows 10 Version 1507, Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows Server 2008 R2 Service Pack 1, Windows Server 2008 R2 Service Pack 1 (Server Core installation), Windows Server 2008 Service Pack 2, Windows Server 2008.... Previdian lists 25 version rows; examples include 10.0.10240.0 to < 10.0.10240.21014, 10.0.14393.0 to < 10.0.14393.8066, and 10.0.17763.0 to < 10.0.17763.7314.

Vulnerability report

Trusted Third Party Report Confirmed Confidence In CISA KEV

CVE-2025-32709

Q: Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Listed in CISA KEV. Also reported by third-party sources. Confidence is confirmed.

Q: What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Windows 10 Version 1507

Microsoft / Windows 10 Version 1507 · affected before 10.0.10240.21014

Watch CVE-2025-32709 Browse KEV feed

Severity: CVSS 7.8 · High
Confidence: Confirmed
Exploit status: Trusted Third Party Report
EPSS: 1.8%
First observed: —
Last observed: —

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

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

Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Listed in CISA KEV. Also reported by third-party sources. Confidence is confirmed.

Who is affected?

Affected products include Microsoft / Windows 10 Version 1507 and 25 other products, including affected before 10.0.10240.21014, affected before 10.0.14393.8066, and affected before 10.0.17763.7314.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Windows 10 Version 1507

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

Vendor Product Affected Status

Microsoft Affected

Windows 10 Version 1507

Before 10.0.10240.21014

Affected

Microsoft Affected

Windows 10 Version 1607

Before 10.0.14393.8066

Affected

Microsoft Affected

Windows 10 Version 1809

Before 10.0.17763.7314

Affected

Microsoft Affected

Windows 10 Version 21H2

Before 10.0.19044.5854

Affected

Microsoft Affected

Windows 10 Version 22H2

Before 10.0.19045.5854

Affected

Microsoft Affected

Windows 11 version 22H2

Before 10.0.22621.5335

Affected

Microsoft Affected

Windows 11 version 22H3

Before 10.0.22631.5335

Affected

Microsoft Affected

Windows 11 Version 23H2

Before 10.0.22631.5335

Affected

Microsoft Affected

Windows 11 Version 24H2

Before 10.0.26100.4061

Affected

Microsoft Affected

Windows Server 2008 R2 Service Pack 1

Before 6.1.7601.27730

Affected

Microsoft Affected

Windows Server 2008 R2 Service Pack 1 (Server Core installation)

Before 6.1.7601.27730

Affected

Microsoft Affected

Windows Server 2008 Service Pack 2

Before 6.0.6003.23317

Affected

Microsoft Affected

Windows Server 2008 Service Pack 2 (Server Core installation)

Before 6.0.6003.23317

Affected

Microsoft Affected

Windows Server 2012

Before 6.2.9200.25475

Affected

Microsoft Affected

Windows Server 2012 (Server Core installation)

Before 6.2.9200.25475

Affected

Microsoft Affected

Windows Server 2012 R2

Before 6.3.9600.22577

Affected

Microsoft Affected

Windows Server 2012 R2 (Server Core installation)

Before 6.3.9600.22577

Affected

Microsoft Affected

Windows Server 2016

Before 10.0.14393.8066

Affected

Microsoft Affected

Windows Server 2016 (Server Core installation)

Before 10.0.14393.8066

Affected

Microsoft Affected

Windows Server 2019

Before 10.0.17763.7314

Affected

Microsoft Affected

Windows Server 2019 (Server Core installation)

Before 10.0.17763.7314

Affected

Microsoft Affected

Windows Server 2022

Before 10.0.20348.3692

Affected

Microsoft Affected

Windows Server 2022, 23H2 Edition (Server Core installation)

Before 10.0.25398.1611

Affected

Microsoft Affected

Windows Server 2025

Before 10.0.26100.4061

Affected

Microsoft Affected

Windows Server 2025 (Server Core installation)

Before 10.0.26100.4061

Affected

View vendor advisory

Published: 13 May 2025
Exploitation Attempts Reported: 21 May 2025
Attack vector: Local
Complexity: Low
Privileges: Low
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2025-32709
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability msrc.microsoft.com · Vendor Advisory https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-32709

Exploitation evidence

Evidence of exploitation attempts

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploitation Attempts Observed in the Wild

CVE

Recorded 21 May 2025

A trusted third party reported exploitation attempts.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access

Source	Added
CVE First	2025-05-21 13:11 UTC
CISA	2026-06-02 14:08 UTC
Tenable Blog	2026-08-11 18:04 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.8 High

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

1.8%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Use After Free CWE-416

Recent mention · Tenable Blog

11 Aug 2026

Microsoft's August 2026 Patch Tuesday addresses 398 CVEs (CVE-2026-68820)

Read full advisory

All Mentions

Recent mention · Tenable Blog

Microsoft's August 2026 Patch Tuesday addresses 398 CVEs (CVE-2026-68820)

Tenable Blog · 11 Aug 2026

42Critical355Important1Moderate0LowMicrosoft addresses 398 CVEs in the eighth Patch Tuesday of 2026, with three zero-days, including one that was exploited in the wild.Microsoft patched 398 CVEs in its August 2026 Patch Tuesday release, with 42 rated critical, 355 rated as important and one rated as moderate. Our counts omitted two CVEs assigned by MITRE; CVE-2026-6726 and CVE-2026-6727.This month’s update includes patches for:.NET.NET Core.NET FrameworkAMD ZenActive Directory Certificate Services (AD CS)Application Information ServicesAzure Active DirectoryAzure CycleCloudAzure Monitor...

Recent mention · Tenable Blog

Microsoft's August 2026 Patch Tuesday Addresses 398 CVEs (CVE-2026-68820)

Tenable Blog · 11 Aug 2026

Timeline

From disclosure to observed exploitation attempts

11 Aug 2026
18:04 UTC

KEV confirmed by Tenable Blog

Exploitation attempts reported by an external source
02 Jun 2026
14:08 UTC

Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
21 May 2025
13:11 UTC

Added to Previdian KEV Feed

High-confidence, third-party report of exploitation attempts
13 May 2025
16:58 UTC

CVE published

Vulnerability disclosed publicly
09 Apr 2025
20:06 UTC

CVE ID reserved

Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2025-32709

Sample API response

{
  "cve_id": "CVE-2025-32709",
  "confidence": "Confirmed",
  "cvss_score": 7.8,
  "cvss_estimated": false,
  "epss_score": 0.01818,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

CVE-2025-32709

Windows 10 Version 1507

Tags

CVE References

Exploitation Attempts Observed in the Wild

Known exploited vulnerability sources

Scanner coverage

Virtual patch status

Weaknesses

Microsoft's August 2026 Patch Tuesday addresses 398 CVEs (CVE-2026-68820)

All Mentions

KEV confirmed by Tenable Blog

Added to CISA KEV

Added to Previdian KEV Feed

CVE published

CVE ID reserved

Automate this intelligence