CVE-2021-3621

Name: CVE-2021-3621
Creator: NVD / NIST
Published: 2021-12-23T21:15:08.92+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.52%

Last modified Jun 17, 2026

CVE-2021-3621 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. A flaw was found in SSSD, where the sssctl command was vulnerable to shell command injection via the logs-fetch and cache-expire subcommands. This flaw allows an attacker to trick the root user into running a specially crafted sssctl command, such as via sudo, to gain root access. EPSS estimates a 2.52% chance of exploitation in the next 30 days.

Description

A flaw was found in SSSD, where the sssctl command was vulnerable to shell command injection via the logs-fetch and cache-expire subcommands. This flaw allows an attacker to trick the root user into running a specially crafted sssctl command, such as via sudo, to gain root access. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

2.52%

82.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Fedoraproject	Sssd	2.6.0
Redhat	Virtualization	4.0
Redhat	Virtualization Host	4.0
Redhat	Enterprise Linux	6.0
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux Eus	8.1
Redhat	Enterprise Linux Eus	8.2
Redhat	Enterprise Linux Server Aus	8.2
Redhat	Enterprise Linux Server Aus	8.4
Redhat	Enterprise Linux Server Tus	8.2
Redhat	Enterprise Linux Server Tus	8.4
Fedoraproject	Fedora	34

References

https://bugzilla.redhat.com/show_bug.cgi?id=1975142Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/05/msg00028.htmlThird Party Advisory
https://sssd.io/release-notes/sssd-2.6.0.htmlRelease Notes, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1975142Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/05/msg00028.htmlThird Party Advisory
https://lists.debian.org/debian-lts-announce/2025/02/msg00008.html
https://sssd.io/release-notes/sssd-2.6.0.htmlRelease Notes, Third Party Advisory

Timeline

Published: Dec 23, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3621?

How severe is CVE-2021-3621?

CVE-2021-3621 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.52% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3621?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3621?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST