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Description

Heap-based buffer overflow in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

PUBLISHED Reserved 2025-09-11 | Published 2025-10-14 | Updated 2025-11-22 | Assigner microsoft




HIGH: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Problem types

CWE-122: Heap-based Buffer Overflow

CWE-191: Integer Underflow (Wrap or Wraparound)

Product status

10.0.17763.0 (custom) before 10.0.17763.7919
affected

10.0.17763.0 (custom) before 10.0.17763.7919
affected

10.0.17763.0 (custom) before 10.0.17763.7919
affected

10.0.20348.0 (custom) before 10.0.20348.4294
affected

10.0.19044.0 (custom) before 10.0.19044.6456
affected

10.0.22621.0 (custom) before 10.0.22621.6060
affected

10.0.19045.0 (custom) before 10.0.19045.6456
affected

10.0.26100.0 (custom) before 10.0.26100.6899
affected

10.0.26200.0 (custom) before 10.0.26200.6899
affected

10.0.22631.0 (custom) before 10.0.22631.6060
affected

10.0.22631.0 (custom) before 10.0.22631.6060
affected

10.0.25398.0 (custom) before 10.0.25398.1913
affected

10.0.26100.0 (custom) before 10.0.26100.6899
affected

10.0.26100.0 (custom) before 10.0.26100.6899
affected

10.0.10240.0 (custom) before 10.0.10240.21161
affected

10.0.14393.0 (custom) before 10.0.14393.8519
affected

10.0.14393.0 (custom) before 10.0.14393.8519
affected

10.0.14393.0 (custom) before 10.0.14393.8519
affected

6.0.6003.0 (custom) before 6.0.6003.23571
affected

6.0.6003.0 (custom) before 6.0.6003.23571
affected

6.1.7601.0 (custom) before 6.1.7601.27974
affected

6.1.7601.0 (custom) before 6.1.7601.27974
affected

6.2.9200.0 (custom) before 6.2.9200.25722
affected

6.2.9200.0 (custom) before 6.2.9200.25722
affected

6.3.9600.0 (custom) before 6.3.9600.22824
affected

6.3.9600.0 (custom) before 6.3.9600.22824
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59242 (Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability) vendor-advisory

cve.org (CVE-2025-59242)

nvd.nist.gov (CVE-2025-59242)

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