CVE-2025-53805: HTTP.sys Denial of Service Vulnerability

Overview

Severity

High (CVSS 7.5)

CVSS Vector

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

Category

Denial of Service

Exploit Status

Not Exploited

Exploitation Likelihood

Unlikely

Patch Tuesday

2025-Sep

Released

2025-09-09

EPSS Score

0.16% (percentile: 37.1%)

Description

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

Affected Products (11)

Windows

• Windows Server 2022
• Windows Server 2022 (Server Core installation)
• Windows Server 2025 (Server Core installation)
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows Server 2022, 23H2 Edition (Server Core installation)
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows 11 Version 24H2 for x64-based Systems
• Windows Server 2025

ESU

• Windows 11 Version 22H2 for ARM64-based Systems
• Windows 11 Version 22H2 for x64-based Systems

Security Updates (6)

• 5065432
• 5065306
• 5065431
• 5065426
• 5065474
• 5065425

Acknowledgments

Rutuja Shirali with Microsoft, Yesayi Hovnanyan with Microsoft, Matthew Cox with Microsoft, Matthew Cox with Microsoft

Revision History

• 2025-09-09: Information published.