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

criticalknown exploitedpublic exploitCVE-2021-31166
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Microsoft HTTP Protocol Stack contains a vulnerability in http.sys that allows for remote code execution.

CSIRTS triage

vendor: Microsoftproduct: HTTP Protocol StackRemote code execution
What
A vulnerability in http.sys allows for remote code execution.
Who is affected
Users of Microsoft HTTP Protocol Stack are affected.
Urgency
Remediation is critical as the vulnerability is actively exploited and severe.
Action
Install the latest updates for the HTTP Protocol Stack.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2022-04-06
Exploitation
Observed in the wild (CISA KEV)

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

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-31166coverage & exploitation statusNVD · CVE.org

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