CVE-2021-31166

Published: May 11, 2021Modified: Oct 30, 2025CISA KEV

9.8

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitability: 3.9 / Impact: 5.9

Source: NVD (Secondary)

Description

HTTP Protocol Stack Remote Code Execution Vulnerability

Affected (4)

Products: Microsoft: Windows 10 2004, Windows 10 20h2, Windows Server 2004, Windows Server 20h2

4 products

Windows 10 2004

Windows 10 20h2

Windows Server 2004

Windows Server 20h2

Configuration A

4 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 2004	Before 10.0.19041.982
Microsoft Windows 10 20h2	Before 10.0.19042.982
Microsoft Windows Server 2004	Before 10.0.19041.982
Microsoft Windows Server 20h2	Before 10.0.19042.982

Related CWEs

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (5)

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

Source: secure@microsoft.com

Third Party AdvisoryVDB Entry

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

Source: secure@microsoft.com

PatchVendor Advisory

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

Source: af854a3a-2127-422b-91ae-364da2661108

Third Party AdvisoryVDB Entry

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

Source: af854a3a-2127-422b-91ae-364da2661108

PatchVendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-31166

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

US Government Resource

Timeline

No history available yet.