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Fencer Vulns
medium 6.1

CVE-2021-3509 json

A flaw was found in Red Hat Ceph Storage 4, in the Dashboard component.

published 2021-05-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26828

cvss
6.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 77%
public exploits
0
none known

Summary

A flaw was found in Red Hat Ceph Storage 4, in the Dashboard component. In response to CVE-2020-27839, the JWT token was moved from localStorage to an httpOnly cookie. However, token cookies are used in the body of the HTTP response for the documentation, which again makes it available to XSS.The greatest threat to the system is for confidentiality, integrity, and availability.

Patch / fix

  • ceph Debian 14, Debian 13, Debian 12 14.2.21-1

debian advisories DEBIAN-CVE-2021-3509

  • ceph Ubuntu 20.04 LTS 15.2.12-0ubuntu0.20.04.1

ubuntu advisories UBUNTU-CVE-2021-3509

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ceph ceph storage 4 2:14.2.11-181.el7cp
  • ceph ceph storage 4 2:14.2.11-181.el8cp
  • librbd1 ceph storage 4 2:14.2.11-181.el7cp
  • librbd1 ceph storage 4 2:14.2.11-181.el8cp
  • librgw2 ceph storage 4 2:14.2.11-181.el7cp
  • librgw2 ceph storage 4 2:14.2.11-181.el8cp
  • rbd-nbd ceph storage 4 2:14.2.11-181.el7cp
  • rbd-nbd ceph storage 4 2:14.2.11-181.el8cp

red hat advisories RHSA-2021:2445

  • ceph SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLES 15 SP1-BCL +6 more 14.2.21.403+g69ab6ea274d-3.63.1
  • ceph SLE Module for Basesystem 15 SP3, SLE Module for Basesystem 15 SP2, SLE Micro 5.0 +1 more 15.2.12.83+g528da226523-3.25.1

suse advisories SUSE-SU-2021:1835-1SUSE-SU-2021:1834-1

  • ceph openSUSE Leap 15.3 15.2.12.83+g528da226523-3.25.1
  • ceph-test openSUSE Leap 15.3 15.2.12.83+g528da226523-3.25.1
  • ceph openSUSE Leap 15.2 15.2.12.83+g528da226523-lp152.2.18.1
  • ceph-test openSUSE Leap 15.2 15.2.12.83+g528da226523-lp152.2.18.1

opensuse advisories openSUSE-SU-2021:1834-1openSUSE-SU-2021:0833-1

  • ceph Alpine 3.16, Alpine 3.15, Alpine 3.14 16.2.4-r0
  • ceph16 Alpine 3.18, Alpine 3.17 16.2.4-r0

alpine advisories ALPINE-CVE-2021-3509

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-3509 updated cvss 8.1

ceph-dashboard: Cross-site scripting via token Cookie

  • Red Hat Ceph Storage 2 ceph, librbd1, librgw2, ceph-mds, ceph-mon, ceph-osd, +12 more Red Hat Ceph Storage 3 ceph, librbd1, librgw2, ceph-mds, ceph-mgr, ceph-mon, +15 more
    affected: no fix planned “Out of support scope”
  • Red Hat Openshift Container Storage 4 ceph Red Hat OpenStack Platform 13 (Queens) librbd1, librgw2, ceph-fuse, librados2, libcephfs2, python-rbd, +6 more
    affected: no fix planned “Will not fix”
  • Red Hat Ceph Storage 4.2 MON ceph 14.2.11-181.el7cp, ceph 14.2.11-181.el8cp, librbd1 14.2.11-181.el7cp, librbd1 14.2.11-181.el8cp, librgw2 14.2.11-181.el7cp, librgw2 14.2.11-181.el8cp, +38 more Red Hat Ceph Storage 4.2 OSD ceph 14.2.11-181.el7cp, ceph 14.2.11-181.el8cp, librbd1 14.2.11-181.el7cp, librbd1 14.2.11-181.el8cp, librgw2 14.2.11-181.el7cp, librgw2 14.2.11-181.el8cp, +26 more Red Hat Ceph Storage 4.2 Tools ceph 14.2.11-181.el7cp, ceph 14.2.11-181.el8cp, librbd1 14.2.11-181.el7cp, librbd1 14.2.11-181.el8cp, librgw2 14.2.11-181.el7cp, librgw2 14.2.11-181.el8cp, +34 more
    fixed: vendor fix RHSA-2021:2445
  • Red Hat Ceph Storage 4.2 MON python-waitress 1.4.2-1.el8ost, python3-waitress 1.4.2-1.el8ost Red Hat Ceph Storage 4.2 Tools libtcmu 1.5.2-4.el7cp, libtcmu 1.5.2-4.el8cp, ceph-iscsi 3.4-4.el7cp, ceph-iscsi 3.4-4.el8cp, tcmu-runner 1.5.2-4.el7cp, tcmu-runner 1.5.2-4.el8cp, +2 more Red Hat Enterprise Linux 8 librbd1, librados2, libcephfs2, libradosstriper1 Red Hat Enterprise Linux 9 librbd1, librados2
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.70% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/ceph/ceph/blob/f1557e8f62d31883d3d34ae241a1a26af11d923f/src/pybind/mgr/dashboard/controllers/docs.py#L394-L409 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

  • n/a ceph-dashboard

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.