Cyber Resilience

CVE-2021-3621

HighRCE

Published: 23 December 2021

Published
23 December 2021
Modified
03 November 2025
KEV Added
Patch
CVSS Score v3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.0038 60.1th percentile
Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-3621 is a high-severity Command Injection (CWE-77) vulnerability in Redhat Enterprise Linux. Its CVSS base score is 8.8 (High).

Operationally, ranked in the top 39.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

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as via sudo, to gain root access. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

CWE(s)

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

fedoraproject
sssd
2.6.0
redhat
virtualization
4.0
redhat
virtualization host
4.0
redhat
enterprise linux
6.0, 7.0, 8.0
redhat
enterprise linux eus
8.1, 8.2
redhat
enterprise linux server aus
8.2, 8.4
redhat
enterprise linux server tus
8.2, 8.4
fedoraproject
fedora
34

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

References