CVE-2021-3979

Name: CVE-2021-3979
Creator: NVD / NIST
Published: 2022-08-25T20:15:09.473+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.44%

Last modified Jun 17, 2026

CVE-2021-3979 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A key length flaw was found in Red Hat Ceph Storage. An attacker can exploit the fact that the key length is incorrectly passed in an encryption algorithm to create a non random key, which is weaker and can be exploited for loss of confidentiality and integrity on encrypted disks.. EPSS estimates a 0.44% chance of exploitation in the next 30 days.

Description

A key length flaw was found in Red Hat Ceph Storage. An attacker can exploit the fact that the key length is incorrectly passed in an encryption algorithm to create a non random key, which is weaker and can be exploited for loss of confidentiality and integrity on encrypted disks.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.44%

34.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Redhat	Ceph Storage	3.0
Redhat	Ceph Storage	4.3
Redhat	Ceph Storage	5.1
Redhat	Openshift Container Storage	4.0
Redhat	Openshift Data Foundation	4.0
Redhat	Openstack Platform	13.0
Redhat	Ceph Storage For Ibm Z Systems	4.0
Redhat	Ceph Storage	4.0
Redhat	Ceph Storage	5.0
Redhat	Ceph Storage For Power	4.0
Fedoraproject	Fedora	35
Fedoraproject	Fedora	37

References

https://access.redhat.com/security/cve/CVE-2021-3979Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2024788Issue Tracking, Vendor Advisory
https://github.com/ceph/ceph/commit/47c33179f9a15ae95cc1579a421be89378602656Patch, Third Party Advisory
https://github.com/ceph/ceph/pull/44765Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/10/msg00034.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BPOK44BESMIFW6BIOGCN452AKKOIIT6Q/Mailing List
https://tracker.ceph.com/issues/54006Issue Tracking, Vendor Advisory
https://access.redhat.com/security/cve/CVE-2021-3979Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2024788Issue Tracking, Vendor Advisory
https://github.com/ceph/ceph/commit/47c33179f9a15ae95cc1579a421be89378602656Patch, Third Party Advisory
https://github.com/ceph/ceph/pull/44765Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/10/msg00034.html
https://lists.debian.org/debian-lts-announce/2025/09/msg00025.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BPOK44BESMIFW6BIOGCN452AKKOIIT6Q/Mailing List
https://tracker.ceph.com/issues/54006Issue Tracking, Vendor Advisory

Timeline

Published: Aug 25, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3979?

How severe is CVE-2021-3979?

CVE-2021-3979 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.44% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3979?

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-2021-3979?

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

Scan your code now

Source: NVD / NIST