Live › vulnerability › CVE-2021-31166
Go to dashboardMicrosoft's HTTP Protocol Stack (http.sys) contains a flaw that allows remote code execution. An attacker who can send crafted HTTP requests to a vulnerable Windows server can run code on it; CISA lists it as actively exploited.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
Apply updates per vendor instructions.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Microsoft HTTP Protocol Stack | vendor | – | – |
Unknown from the sources.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Microsoft HTTP Protocol Stack contains a vulnerability in http.sys that allows for remote code execution.
CISA required action: Apply updates per vendor instructions.
This page as .md · .json · in your agent: get_signal("CVE-2021-31166")
CISA KEV catalog, Creative Commons 0 · EPSS scores by FIRST, used with attribution · NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.