CVE-2021-3660: Cockpit (and its plugins) do not seem to protect itself against clickjacking

Q: How do I fix CVE-2021-3660?

cockpit: upgrade to 254; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2021-3660 being exploited?

CVE-2021-3660 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-3660 affect?

CVE-2021-3660 affects cockpit, enterprise linux. Severity is medium (CVSS 4.3). 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 HTML entry. This may be used by a malicious website in clickjacking

Routine

MEDIUM 4.3WATCHLISTUPGRADEMITIGATE

CVE-2021-3660 is a medium-severity flaw (CVSS 4.3) affecting cockpit, enterprise linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-1021
Published	2022-03-10
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: cockpit-project · redhat

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-03-10 17:42 UTCPublished CVE record published
2026-06-17 04:05 UTCUpdated Record last modified

cockpit-project cockpit UPGRADE

Affected: < 254

Fixed in: 254

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy cockpit || rpm -q cockpit || cockpit --version

2. UPGRADE to 254 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cockpit

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cockpit

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

redhat enterprise linux MITIGATE

Affected: 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-3660?

cockpit: upgrade to 254; enterprise linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-3660 being exploited?

CVE-2021-3660 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-3660 affect?

CVE-2021-3660 affects cockpit, enterprise linux. Severity is medium (CVSS 4.3). 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

How urgent is CVE-2021-3660?

Priority 37/100. On your watchlist

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References

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