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CVE-2021-3621

28
FAUCET Score

CVE-2021-3621 is a critical shell command injection vulnerability in SSSD's sssctl utility, specifically impacting the logs-fetch and cache-expire subcommands. This flaw allows an attacker to trick a root user into executing a specially crafted sssctl command, potentially leading to root access on affected Fedora and Red Hat systems. The vulnerability carries a high CVSS score of 8.8, indicating high impact on confidentiality, integrity, and availability, with low attack complexity and requiring user interaction. Currently, there is no evidence of active exploitation, nor are there publicly available exploit modules or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
2.6.0CPE matchmatch criteria
cpe:2.3:a:fedoraproject:sssd:2.6.0:*:*:*:*:*:*:*
4.0CPE matchmatch criteria
cpe:2.3:a:redhat:virtualization:4.0:*:*:*:*:*:*:*
4.0CPE matchmatch criteria
cpe:2.3:a:redhat:virtualization_host:4.0:*:*:*:*:*:*:*
6.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
7.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.52%
Probability of exploitation in next 30 days
EPSS Percentile
83.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0252 is in the 82nd percentile among its peer group of 14,875 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: sssd-0:1.16.5-10.el7_9.10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: sssd-0:2.4.0-9.el8_4.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.1 Extended Update SupportFixed in: sssd-0:2.2.0-19.el8_1.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8.2 Extended Update SupportFixed in: sssd-0:2.2.3-20.el8_2.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4 for Red Hat Enterprise Linux 7Fixed in: redhat-virtualization-host-0:4.3.18-20210903.0.el7_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4 for Red Hat Enterprise Linux 8Fixed in: redhat-virtualization-host-0:4.4.7-20210804.0.el8_4
View patch

Vendor Advisories (1)

redhatCVE-2021-3621Important

sssd: shell command injection in sssctl

Aug 16, 2021

References

lists.debian.org / debian-lts-announce/2025/02/msg00008.html
bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchThird Party Advisory
lists.debian.org / debian-lts-announce/2023/05/msg00028.html
Third Party Advisory
sssd.io / release-notes/sssd-2.6.0.html
Release NotesThird Party Advisory