CVE-2025-59242: Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Published Oct 14, 2025
·Updated
Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Other sources
Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
— Microsoft
Affected Software
61 affected componentsFixes available
Microsoft Windows Server 2008 R2
Microsoft Windows Server 2012
Microsoft Windows Server 2008
Microsoft Windows Server 2008 R2
Microsoft Windows Server 2012 R2
Microsoft Windows Server 2012 R2
Microsoft Windows Server 2012
Microsoft Windows Server 2008
Microsoft Windows Server 2016
Microsoft Windows Server 2008
Microsoft Windows Server 2008
Microsoft Windows 10=1607
Microsoft Windows Server 2016
Microsoft Windows 11=24H2
Microsoft Windows 10
Microsoft Windows 11=23H2
Microsoft Windows Server 2025
Microsoft Windows 10=1607
Microsoft Windows 11=24H2
Microsoft Windows Server 2022, 23H2 Edition
Microsoft Windows 11=23H2
Microsoft Windows 10
Microsoft Windows Server 2025
Microsoft Windows 11=25H2
Microsoft Windows 11=25H2
Microsoft Windows 10=22H2
Microsoft Windows 10=22H2
Microsoft Windows 11=22H2
Microsoft Windows 10=22H2
Microsoft Windows 11=22H2
Microsoft Windows 10=21H2
Microsoft Windows 10=21H2
Microsoft Windows 10=21H2
Microsoft Windows Server 2022
Microsoft Windows Server 2019
Microsoft Windows 10=1809
Microsoft Windows Server 2022
Microsoft Windows Server 2019
Microsoft Windows 10=1809
Microsoft Windows 10 1507<10.0.10240.21161
Microsoft Windows 10 1507<10.0.10240.21161
Microsoft Windows 10 1607<10.0.14393.8519
Microsoft Windows 10 1607<10.0.14393.8519
Microsoft Windows 10 1809<10.0.17763.7919
Microsoft Windows 10 1809<10.0.17763.7919
Microsoft Windows 10 21h2<10.0.19044.6456
Microsoft Windows 10 22h2<10.0.19045.6456
Microsoft Windows 11 22h2<10.0.22621.6060
Microsoft Windows 11 23h2<=10.0.22631.6060
Microsoft Windows 11 24h2<10.0.26100.6899
Microsoft Windows 11 25h2<10.0.26200.6899
Microsoft Windows Server 2008=sp2
Microsoft Windows Server 2008=sp2
Microsoft Windows Server 2008=r2-sp1
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
Microsoft Windows Server 2016<=10.0.14393.8519
Microsoft Windows Server 2019<10.0.17763.7919
Microsoft Windows Server 2022<10.0.20348.4294
Microsoft Windows Server 2022 23h2<10.0.25398.1913
Microsoft Windows Server 2025<=10.0.26100.6899
Event History
Oct 14, 2025
CVE Published
via Microsoft·07:00 AM
Data Sourced
via Microsoft·07:00 AM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Description
CVE Published
via MITRE·05:00 PM
Data Sourced
via MITRE·05:00 PM
DescriptionSeverity
Data Sourced
via NVD·05:16 PM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2025-59242?
CVE-2025-59242 is rated as a critical elevation of privilege vulnerability.
2
How do I fix CVE-2025-59242?
To address CVE-2025-59242, apply the relevant security updates provided by Microsoft for your affected software.
3
What systems are affected by CVE-2025-59242?
CVE-2025-59242 affects various Microsoft Windows Server versions including Windows Server 2008, 2012, and 2016.
4
Can CVE-2025-59242 be exploited remotely?
CVE-2025-59242 requires local access for an attacker to exploit the vulnerability.
5
What are the potential impacts of CVE-2025-59242?
Exploitation of CVE-2025-59242 can allow an authorized user to elevate their privileges on the affected system.