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CVE-2021-3531

19
FAUCET Score

CVE-2021-3531 is a denial-of-service vulnerability affecting Red Hat Ceph Storage RGW versions prior to 14.2.21, as well as various Fedora and Red Hat Ceph Storage products. An unauthenticated attacker can trigger a crash in the RGW by sending a specially crafted GET request to a Swift URL ending with two slashes. With a CVSS score of 5.3 (Medium), this vulnerability primarily impacts system availability. 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
< 14.2.21CPE matchmatch criteria
cpe:2.3:a:redhat:ceph:*:*:*:*:*:*:*:*
4.0CPE matchmatch criteria
cpe:2.3:a:redhat:ceph_storage:4.0:*:*:*:*:*:*:*
32CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
33CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
34CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.43%
Probability of exploitation in next 30 days
EPSS Percentile
82.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0243 is in the 74th percentile among its peer group of 23,723 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 (5)

redhatpatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Ceph Storage 5.1Fixed in: ceph-2:16.2.7-98.el8cp
View patch
redhatno patchvia redhat_api
Product: Red Hat Ceph Storage 4Fixed in: ceph
redhatend of lifevia redhat_api
Product: Red Hat Openshift Container Storage 4Fixed in: ceph
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 13 (Queens)Fixed in: ceph

Vendor Advisories (1)

redhatCVE-2021-3531Moderate

ceph: RGW unauthenticated denial of service

May 13, 2021

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingPatchVendor Advisory
lists.debian.org / debian-lts-announce/2023/10/msg00034.html
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/FX5ZHI5L7FOHXOSEV3TYBAL66DMLJ7V5
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/LPCJN2YDZCBMF4FOJXSTAADKFGEQEO7O
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/ZRUNDH2TJRZRWL3DCH2PQ6KROWTPQ7AJ
openwall.com / lists/oss-security/2021/05/14/5
Mailing ListPatchThird Party Advisory
openwall.com / lists/oss-security/2021/05/17/7
Mailing ListPatchThird Party Advisory