CVE-2021-31166

critical

Description

HTTP Protocol Stack Remote Code Execution Vulnerability

From the Tenable Blog

Microsoft’s May 2021 Patch Tuesday Addresses 55 CVEs (CVE-2021-31166)

Published: 2021-05-11

After crossing the 100 CVEs patched mark for the first time in April, Microsoft patched just 55 CVEs in May, the lowest number of CVEs patched this year.

References

http://packetstormsecurity.com/files/162722/Microsoft-HTTP-Protocol-Stack-Remote-Code-Execution.html

https://www.tenable.com/cyber-exposure/a-look-inside-the-ransomware-ecosystem

https://web.archive.org/web/20211025233339/https://twitter.com/pancak3lullz/status/1452679527197560837

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31166

Details

Source: Mitre, NVD

Published: 2021-05-11

Updated: 2025-03-13

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

EPSS

EPSS: 0.93043

Detections

Analytics