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Fencer Vulns
medium 4.3

CVE-2021-3660 json

Cockpit (and its plugins) do not seem to protect itself against clickjacking.

published 2022-03-07 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-26955

cvss
4.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 69%
public exploits
0
none known

Summary

Cockpit (and its plugins) do not seem to protect itself against clickjacking. It is possible to render a page from a cockpit server via another website, inside an <iFrame> HTML entry. This may be used by a malicious website in clickjacking or similar attacks.

Patch / fix

  • cockpit-project cockpit 254
  • cockpit Debian 14, Debian 13, Debian 12 254-1

debian advisories DEBIAN-CVE-2021-3660

  • cockpit RHEL 8 264.1-1.el8
  • cockpit-ws RHEL 8 264.1-1.el8
  • cockpit-bridge RHEL 8 264.1-1.el8
  • cockpit-system RHEL 8 264.1-1.el8

red hat advisories RHSA-2022:2008

  • cockpit AlmaLinux 8 264.1-1.el8
  • cockpit-ws AlmaLinux 8 264.1-1.el8
  • cockpit-bridge AlmaLinux 8 264.1-1.el8
  • cockpit-system AlmaLinux 8 264.1-1.el8

almalinux advisories ALSA-2022:2008

  • cockpit Rocky Linux 8 264.1-1.el8

rocky linux advisories RLSA-2022:2008

  • cockpit Arch Linux 254-1

arch linux advisories AVG-2430

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-2021-3660 updated cvss 4.3

cockpit: pages vulnerable to clickjacking

  • Red Hat Enterprise Linux 7 cockpit, cockpit-ws, cockpit-bridge, cockpit-system, cockpit-machines-ovirt Red Hat OpenShift Container Platform 3.11 cockpit, cockpit-kubernetes
    affected: no fix planned “Out of support scope”
  • Red Hat Virtualization 4 cockpit-ws, cockpit-pcp, cockpit-bridge, cockpit-docker, cockpit-system, cockpit-machines, +4 more
    affected: no fix available
  • Red Hat Enterprise Linux BaseOS (v. 8) cockpit 264.1-1.el8, cockpit-ws 264.1-1.el8, cockpit-bridge 264.1-1.el8, cockpit-system 264.1-1.el8
    fixed: vendor fix RHSA-2022:2008
  • Red Hat Enterprise Linux 9 cockpit, cockpit-ws, cockpit-pcp, cockpit-bridge, cockpit-system, cockpit-storaged, +2 more
    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

1.26% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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 cockpit

Classification

Weakness
  • CWE-1021 Improper Restriction of Rendered UI Layers or Frames

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.