CVE-2025-53805

HTTP.sys Denial of Service Vulnerability

State: Published
Severity: 7.5 High
Published: Sep 9, 2025
Updated: Feb 20, 2026
Reserved: Jul 9, 2025

Description

Out-of-bounds read in Windows Internet Information Services allows an unauthorized attacker to deny service over a network.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
Windows 11 version 22H2Microsoft	10.0.22621.0 to before 10.0.22621.5909Affected
Windows 11 version 22H3Microsoft	10.0.22631.0 to before 10.0.22631.5909Affected
Windows 11 Version 23H2Microsoft	10.0.22631.0 to before 10.0.22631.5909Affected
Windows 11 Version 24H2Microsoft	10.0.26100.0 to before 10.0.26100.6584Affected
Windows Server 2022Microsoft	10.0.20348.0 to before 10.0.20348.4171Affected
Windows Server 2022, 23H2 Edition (Server Core installation)Microsoft	10.0.25398.0 to before 10.0.25398.1849Affected
Windows Server 2025Microsoft	10.0.26100.0 to before 10.0.26100.6584Affected
Windows Server 2025 (Server Core installation)Microsoft	10.0.26100.0 to before 10.0.26100.6584Affected

References

HTTP.sys Denial of Service Vulnerabilityvendor-advisorypatch

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