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Full vulnerability report · 2025
CVE-2025-32709High confidence

Microsoft Windows Ancillary Function Driver for WinSock Use-After-Free Vulnerability

Microsoft · Windows

7.8HighCVSS 3.1
Recommended action
Protect now

CISA confirms exploitation in the wild and lists 2025-06-03 as the remediation due date.

Fix not verified
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2025-14439

CISA KEV mirrored by ENISA

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

EUVD state
Present in the current official mapping
Known exploitation
Recorded by ENISA since 13 May 2025. Evidence sources: cisa_kev.
ENISA score
7.8 · CVSS 3.1
Advisory evidence
2 linked advisory records
Explicit mitigation evidence

Only statements that explicitly mention a fix, patch, update, workaround or mitigation are shown here.

  • csaf_ncscnl · NCSC-2025-0159Kwetsbaarheden verholpen in Microsoft Windows
Recommended actionProtect now

CISA confirms exploitation in the wild and lists 2025-06-03 as the remediation due date.

Fix not verified
01

What, why and how

Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to escalate privileges to administrator.

What

Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to escalate privileges to administrator.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Microsoft Windows Ancillary Function Driver for WinSock contains a use-after-free vulnerability that allows an authorized attacker to escalate privileges to administrator.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

How

An attacker operating through local access may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Confirmed in the wild

CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2025-05-13.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
local access → Use After Free → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-416 ↗

CWE-416: Use After Free. The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVLocalAttack vector: The attacker needs local access to the vulnerable system.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
CWE-416CISA KEV
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2025-14439Known-exploited evidence recorded

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

Official EUVD record
BSI · German · WID-SEC-W-2025-1050Microsoft Windows Server: Mehrere Schwachstellen ermöglichen Privilegieneskalation

Ein entfernter, anonymer Angreifer, oder lokaler Angreifer, oder ein Angreifer aus einem angrenzenden Netzwerk kann mehrere Schwachstellen in Microsoft Windows Server, Microsoft Windows Server 2012, Microsoft Windows Server 2012 R2, Microsoft Windows 10, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows, Microsoft Windows Server 2022 und Microsoft Windows 11 ausnutzen, um einen Denial-of-Service auszulösen, Informationen offenzulegen, beliebigen Programmcode auszuführen oder seine Privilegien zu erweitern.

Official advisory
CERT-FR · French · CERTFR-2025-AVI-0405Multiples vulnérabilités dans Microsoft Windows

e sécurité Microsoft Windows CVE-2025-29974 du 13 mai 2025 Bulletin de sécurité Microsoft Windows CVE-2025-30385 du 13 mai 2025 Bulletin de sécurité Microsoft Windows CVE-2025-30388 du 13 mai 2025 Bulletin de sécurité Microsoft Windows CVE-2025-30394 du 13 mai 2025 Bulletin de sécurité Microsoft Windows CVE-2025-30397 du 13 mai 2025 Bulletin de sécurité Microsoft Windows CVE-2025-30400 du 13 mai 2025 Bulletin de sécurité Microsoft Windows CVE-2025-32701 du 13 mai 2025 Bulletin de sécurité Microsoft Windows CVE-2025-32706 du 13 mai 2025 Bulletin de sécurité Microsoft Windows CVE-2025-32707 du 13 mai 2025 Bulletin de sécurité Microsoft Windows CVE-2025-32709 du 13 mai 2025 Une gestion de version détaillée se trouve à la fin de ce document. Risques Atteinte à la confidentialité des données Contournement de la politique de sécurité Déni de service à distance Exécution de code arbitraire à distance Élévation de privilèges Systèmes affectés Windows 10 HLK version 20H2 antérieures à 10.1.19041.5609 Windows 10 HLK version 21H1 antérieures à 10.1.19041.5609 Windows 10 HLK version 21H2 antérieures à 10.1.19041.5609 Windows 10 HLK Version 22H2 versions antérieures à 10.1.19041.5609 Windows 10 pour systèmes 32 bits versions antérieures à 10.0.10240.21014 Windows 10 pour systèmes x64 versions antérieures à

Official advisory
NCSC-NL · Dutch · NCSC-2025-0159Kwetsbaarheden verholpen in Microsoft Windows

Een kwaadwillende kan de kwetsbaarheden misbruiken om aanvallen uit te voeren die kunnen leiden tot de volgende categorieën schade: - Denial-of-Service (DoS) - Omzeilen van een beveiligingsmaatregel - Uitvoer van willekeurige code (root/adminrechten) - Uitvoer van willekeurige code (gebruikersrechten) - Toegang tot systeemgegevens - Toegang tot gevoelige gegevens - Verkrijgen van verhoogde rechten ``` Windows Trusted Runtime Interface Driver: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29829 | 5.50 | Toegang tot gevoelige gegevens | |----------------|------|-------------------------------------| Windows File Server: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29839 | 4.00 | Toegang tot gevoelige gegevens | |----------------|------|-------------------------------------| Windows Remote Desktop: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29966 | 8.80 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| Active Directory Certificate Services (AD CS): |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29968 | 6.50 | Denial-of-Service | |----------------|------|-------------------------------------| Windows Ancillary Function Driver for WinSock: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-32709 | 7.80 | Verkrijgen van verhoogde rechten | |----------------|------|-------------------------------------| Windows Drivers: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29838 | 7.40 | Verkrijgen van verhoogde rechten | |----------------|------|-------------------------------------| Windows Kernel: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29974 | 5.70 | Toegang tot gevoelige gegevens | | CVE-2025-24063 | 7.80 | Verkrijgen van verhoogde rechten | |----------------|------|-------------------------------------| Windows DWM: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-30400 | 7.80 | Verkrijgen van verhoogde rechten | |----------------|------|-------------------------------------| Microsoft Brokering File System: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29970 | 7.80 | Verkrijgen van verhoogde rechten | |----------------|------|-------------------------------------| Windows Installer: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29837 | 5.50 | Toegang tot gevoelige gegevens | |----------------|------|-------------------------------------| Microsoft Scripting Engine: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-30397 | 7.50 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| Windows Hardware Lab Kit: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-27488 | 6.70 | Verkrijgen van verhoogde rechten | |----------------|------|-------------------------------------| Windows Routing and Remote Access Service (RRAS): |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29959 | 6.50 | Toegang tot gevoelige gegevens | | CVE-2025-29960 | 6.50 | Toegang tot gevoelige gegevens | | CVE-2025-29830 | 6.50 | Toegang tot gevoelige gegevens | | CVE-2025-29832 | 6.50 | Toegang tot gevoelige gegevens | | CVE-2025-29835 | 6.50 | Toegang tot gevoelige gegevens | | CVE-2025-29836 | 6.50 | Toegang tot gevoelige gegevens | | CVE-2025-29958 | 6.50 | Toegang tot gevoelige gegevens | | CVE-2025-29961 | 6.50 | Toegang tot gevoelige gegevens | |----------------|------|-------------------------------------| Windows Win32K - GRFX: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-30388 | 7.80 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| Role: Windows Hyper-V: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29955 | 6.20 | Denial-of-Service | |----------------|------|-------------------------------------| Web Threat Defense (WTD.sys): |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29971 | 7.50 | Denial-of-Service | |----------------|------|-------------------------------------| Windows NTFS: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-32707 | 7.80 | Verkrijgen van verhoogde rechten | |----------------|------|-------------------------------------| Remote Desktop Gateway Service: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29967 | 8.80 | Uitvoeren van willekeurige code | | CVE-2025-30394 | 5.90 | Denial-of-Service | | CVE-2025-26677 | 7.50 | Denial-of-Service | | CVE-2025-29831 | 7.50 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| Universal Print Management Service: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29841 | 7.00 | Verkrijgen van verhoogde rechten | |----------------|------|-------------------------------------| Windows Media: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29964 | 8.80 | Uitvoeren van willekeurige code | | CVE-2025-29840 | 8.80 | Uitvoeren van willekeurige code | | CVE-2025-29962 | 8.80 | Uitvoeren van willekeurige code | | CVE-2025-29963 | 8.80 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| Windows Virtual Machine Bus: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29833 | 7.10 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| Windows SMB: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29956 | 5.40 | Toegang tot gevoelige gegevens | |----------------|------|-------------------------------------| Windows Common Log File System Driver: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-32701 | 7.80 | Verkrijgen van verhoogde rechten | | CVE-2025-32706 | 7.80 | Verkrijgen van verhoogde rechten | | CVE-2025-30385 | 7.80 | Verkrijgen van verhoogde rechten | |----------------|------|-------------------------------------| Windows Secure Kernel Mode: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-27468 | 7.00 | Verkrijgen van verhoogde rechten | |----------------|------|-------------------------------------| Windows Fundamentals: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29969 | 7.50 | Uitvoeren van willekeurige code | |----------------|------|-------------------------------------| Windows LDAP - Lightweight Directory Access Protocol: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29954 | 5.90 | Denial-of-Service | |----------------|------|-------------------------------------| Windows Deployment Services: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29957 | 6.20 | Denial-of-Service | |----------------|------|-------------------------------------| UrlMon: |----------------|------|-------------------------------------| | CVE-ID | CVSS | Impact | |----------------|------|-------------------------------------| | CVE-2025-29842 | 7.50 | Omzeilen van beveiligingsmaatregel | |----------------|------|-------------------------------------| ```

Official advisory
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix not verified
Affected
10.0.10240.0 < 10.0.10240.21014; 10.0.14393.0 < 10.0.14393.8066; 10.0.17763.0 < 10.0.17763.7314; 10.0.19044.0 < 10.0.19044.5854; 10.0.19045.0 < 10.0.19045.5854; 10.0.22621.0 < 10.0.22621.5335; 10.0.22631.0 < 10.0.22631.5335
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
No verified patch reference is present in the current structured sources. Check the vendor advisory before making a change.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 13 May 2025 · Last source change 26 Feb 2026, 18:28 UTC · CWE-416 · Use After Free

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2025-14439
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceOther authority
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates →

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Added to CISA KEV
ENISA EUVD · EUVD-2025-14439↗CISA KEV record↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2025-32709 · cve.blacktree.nl