What is CVE-2021-42808?

CVE-2021-42808 is a medium-severity vulnerability in Microsoft Windows, classified under Improper Access Control. CVSS score: 6.5/10. Published 2021-12-20.

How severe is CVE-2021-42808?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Microsoft Windows

CVE-2021-42808

Improper Access Control in Thales Sentinel Protection Installer could allow a local user to escalate privileges.

Published 2021-12-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (11.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 11.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Microsoft Windows
Thales Sentinel Protection Installer — versions 7.7.0
Thalesgroup Sentinel Protection Installer

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

cpl.thalesgroup.com/fr/software-monetization/security-updates (Not Applicable)

Frequently asked questions

What is CVE-2021-42808?: CVE-2021-42808 is a medium-severity vulnerability in Microsoft Windows, classified under Improper Access Control. CVSS score: 6.5/10. Published 2021-12-20.
How severe is CVE-2021-42808?: Medium severity. CVSS v3 base score is 6.5 out of 10.