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CVE-2021-3979

23
FAUCET Score

CVE-2021-3979 describes a key length flaw in Red Hat Ceph Storage and Fedora Project products. This vulnerability allows an attacker to exploit an incorrectly passed key length in an encryption algorithm, leading to the generation of a weaker, non-random encryption key. With a CVSS score of 6.5 (Medium), this flaw can result in a loss of confidentiality and integrity on encrypted disks, with a network attack vector and low attack complexity. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
3.0CPE matchmatch criteria
cpe:2.3:a:redhat:ceph_storage:3.0:*:*:*:*:*:*:*
4.3CPE matchmatch criteria
cpe:2.3:a:redhat:ceph_storage:4.3:*:*:*:*:*:*:*
5.1CPE matchmatch criteria
cpe:2.3:a:redhat:ceph_storage:5.1:*:*:*:*:*:*:*
4.0CPE matchmatch criteria
cpe:2.3:a:redhat:openshift_container_storage:4.0:*:*:*:*:*:*:*
4.0CPE matchmatch criteria
cpe:2.3:a:redhat:openshift_data_foundation:4.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
2.5
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.44%
Probability of exploitation in next 30 days
EPSS Percentile
35.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0044 is in the 22nd percentile among its peer group of 23,690 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (6)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Ceph Storage 4.3Fixed in: ceph-2:14.2.22-110.el8cp
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Ceph Storage 5.1Fixed in: ceph-2:16.2.7-98.el8cp
View patch
redhatvendor investigatingvia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Openshift Data Foundation 4Fixed in: ceph
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 13 (Queens)Fixed in: ceph

Vendor Advisories (1)

redhatCVE-2021-3979Moderate

ceph: Ceph volume does not honour osd_dmcrypt_key_size

Jan 11, 2022

References

lists.debian.org / debian-lts-announce/2025/09/msg00025.html
access.redhat.com / security/cve/CVE-2021-3979
Vendor Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingVendor Advisory
github.com / ceph/ceph/commit/47c33179f9a15ae95cc1579a421be89378602656
PatchThird Party Advisory
github.com / ceph/ceph/pull/44765
PatchThird Party Advisory
lists.debian.org / debian-lts-announce/2023/10/msg00034.html
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/BPOK44BESMIFW6BIOGCN452AKKOIIT6Q
Mailing List
tracker.ceph.com / issues/54006
Issue TrackingVendor Advisory