CVE-2021-31166CISA KEVEPSS p99.9%

CVE-2021-31166Microsoft HTTP Protocol Stack Remote Code Execution Vulnerability

Microsoft / HTTP Protocol Stack

Description

Microsoft HTTP Protocol Stack contains a vulnerability in http.sys that allows for remote code execution.

Scoring

EPSS99.66% probability of exploitation · percentile 99.9% · 2026-06-15T12:03:41Z

CISA KEV entry

Added to KEV: 2022-04-06

(incoming)1

TypeTargetConfidenceTier
KEVEntryMicrosoft HTTP Protocol Stack Remote Code Execution Vulnerabilitykev-cve-2021-311660%live

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Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.