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CVE-2021-3979
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…
- 6.5MediumCVSS base score
- 0.61%Exploitation in 30 daysEPSS · top 50% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By redhat
- 9 months later
· 9 months later
Published
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.61% · top 50% of all CVEs (12 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.
Affected products
ceph
- affected Not-Known
References
References8
- https://bugzilla.redhat.com/show_bug.cgi?id=2024788 (opens in a new tab)x_transferred
- https://access.redhat.com/security/cve/CVE-2021-3979 (opens in a new tab)x_transferred
- https://tracker.ceph.com/issues/54006 (opens in a new tab)x_transferred
- https://github.com/ceph/ceph/pull/44765 (opens in a new tab)x_transferred
- https://github.com/ceph/ceph/commit/47c33179f9a15ae95cc1579a421be89378602656 (opens in a new tab)x_transferred
- FEDORA-2022-d832fd2f45 (opens in a new tab)vendor-advisoryx_transferred
- https://lists.debian.org/debian-lts-announce/2023/10/msg00034.html (opens in a new tab)x_transferred
- https://lists.debian.org/debian-lts-announce/2025/09/msg00025.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2021-27181 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2021-3979)Record last updated .