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Known exploited vulnerability · Microsoft

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

criticalCVSS 3.1 9.8Exploited

HTTP Protocol Stack Remote Code Execution Vulnerability

Published May 11, 2021 · Updated Jun 17, 2026

Required action

Apply updates per vendor instructions.

Advisory details

From the National Vulnerability Database. This product uses the NVD API but is not endorsed or certified by the NVD.

HTTP Protocol Stack Remote Code Execution Vulnerability

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

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