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← All CVEs
CVE Watch—

CVE-2021-31166

Microsoft HTTP Protocol Stack Remote Code Execution Vulnerability

CVSS

—

No CVSS

EPSS

99.9%

p100

KEV

YES

Apr 6, 2022

Exploit Today

80

0-100

Published: — · Last modified: —

EPSS · 30d
99.8%EPSS · 30 days99.9%
2026-09-162026-10-14
KEV catalog record

Product

Microsoft / HTTP Protocol Stack

Vulnerability

Microsoft HTTP Protocol Stack Remote Code Execution Vulnerability

Added to KEV

Apr 6, 2022

Remediate by

Apr 27, 2022

Known ransomware use

No

Summary description

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

Required action

Apply updates per vendor instructions.

Notes

https://nvd.nist.gov/vuln/detail/CVE-2021-31166

Related CVEs

No related CVEs by CWE or product.