CVE-2025-49762

Local privilege escalation via unsynchronized shared resource

Published Aug 12, 2025 · Updated Feb 13, 2026

Race condition in the Windows Ancillary Function Driver for WinSock allows local users with low privileges to elevate privileges. Microsoft identifies concurrent access to a shared AFD resource without proper synchronization, but has not disclosed the affected routine or resource. Exploitation requires local low-privilege access and winning a high-complexity race, after which the attacker gains elevated control of the system.

CVSS severity7.0
High
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Windows Ancillary Function Driver for WinSock allows local users with low privileges to elevate privileges. Microsoft identifies concurrent access to a shared AFD resource without proper synchronization, but has not disclosed the affected routine or resource. Exploitation requires local low-privilege access and winning a high-complexity race, after which the attacker gains elevated control of the system.

The record

CVE
CVE-2025-49762
Published
Aug 12, 2025
Updated
Feb 13, 2026
Vendor
Microsoft
Product
Windows 10 Version 1507
Classifications
CWE-362, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 12, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.10240.0 <10.0.10240.21100

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows 10 Version 1507version=10.0.10240.0 <10.0.10240.21100
Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.7678
Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.4946
Microsoft · Windows Server 2016 (Server Core installation)version=10.0.14393.0 <10.0.14393.8330
Microsoft · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.4946
Microsoft · Windows Server 2012 (Server Core installation)version=6.2.9200.0 <6.2.9200.25622
Microsoft · Windows Server 2012version=6.2.9200.0 <6.2.9200.25622
Microsoft · Windows 10 Version 21H2version=10.0.19044.0 <10.0.19044.6216
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)version=10.0.25398.0 <10.0.25398.1791
Microsoft · Windows Server 2016version=10.0.14393.0 <10.0.14393.8330
Microsoft · Windows 11 Version 22H3version=10.0.22631.0 <10.0.22631.5768
Microsoft · Windows Server 2008 R2 Service Pack 1version=6.1.7601.0 <6.1.7601.27872
Microsoft · Windows Server 2008 R2 Service Pack 1 (Server Core installation)version=6.1.7601.0 <6.1.7601.27872
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.6216
Microsoft · Windows Server 2012 R2 (Server Core installation)version=6.3.9600.0 <6.3.9600.22725
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.7678
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.5768
Microsoft · Windows 11, version 22H2version=10.0.22621.0 <10.0.22621.5768
Microsoft · Windows 10 Version 1607version=10.0.14393.0 <10.0.14393.8330
Microsoft · Windows Server 2008 Service Pack 2version=6.0.6003.0 <6.0.6003.23471
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.4052
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.4946
Microsoft · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.7678
Microsoft · Windows Server 2012 R2version=6.3.9600.0 <6.3.9600.22725
Microsoft · Windows Server 2008 Service Pack 2 (Server Core installation)version=6.0.6003.0 <6.0.6003.23471

Published CVSS scores

7.0NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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