High MSRC-CVE-2025-53805 1 CVE

HTTP.sys Denial of Service Vulnerability

Published Sep 9, 2025 · Updated Sep 9, 2025

Vendor: Microsoft

Summary

Impact: Denial of Service. Microsoft rating: Important. Not known to be exploited — Exploitation Unlikely. Customer action: Required.

Details

Security updates
10.0.20348.4171 — https://support.microsoft.com/help/5065432
10.0.20348.4106 — https://support.microsoft.com/help/5065306
10.0.22621.5909 — https://support.microsoft.com/help/5065431
10.0.26100.6584 — https://support.microsoft.com/help/5065426
10.0.26100.6508 — https://support.microsoft.com/help/5065474
10.0.25398.1849 — https://support.microsoft.com/help/5065425

Vulnerabilities 1

High 7.5

CVE-2025-53805

HTTP.sys Denial of Service Vulnerability

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

Microsoft Windows Server 2022 Windows Server 2025 Windows Server 2025 (Server Core installation) Windows

Sep 9, 2025

Revision history

2025-09-09 #1
Information published.

References

CVE-2025-53805 HTTP.sys Denial of Service Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53805
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss