Microsoft HTTP.sys Remote Code Execution Vulnerability

Microsoft HTTP protocol stack (HTTP.sys) contains a vulnerability that allows for remote code execution.

Published 21 Sep 2026Updated 21 Sep 2026650 sources
CVSS 10.0 ✓ VERIFIED REFERENCE△ CISA KEV

What happened

Microsoft HTTP protocol stack (HTTP.sys) contains a vulnerability that allows for remote code execution.

Affected versions

HTTP.sys: See original advisory Fixed: See vendor advisory.

Why it matters

This source correlation may provide earlier visibility while structured CVE metadata is still being updated.

Detection & mitigation

  • Review the original advisory and validate affected versions.
  • Apply vendor-provided updates or mitigations when available.

Public PoC references