CVE-2021-31961

medium

Description

Windows InstallService Elevation of Privilege Vulnerability

References

https://www.zerodayinitiative.com/advisories/ZDI-21-818/

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31961

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-31961

Details

Source: Mitre, NVD

Published: 2021-07-14

Updated: 2026-08-10

Risk Information

CVSS v2

Base Score: 3.6

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

Severity: Low

CVSS v3

Base Score: 6.1

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

Severity: Medium

EPSS

EPSS: 0.00257