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CVE-2021-3660

18
FAUCET Score

CVE-2021-3660 describes a clickjacking vulnerability in Cockpit and its plugins, affecting products such as cockpit_project cockpit and Red Hat Enterprise Linux. This medium-severity vulnerability (CVSS 4.3) allows an attacker to embed a Cockpit page within an iframe on a malicious website, potentially tricking users into unintended actions. While the attack complexity is low, the impact is limited to integrity, with no confidentiality or availability concerns. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 254CPE matchmatch criteria
cpe:2.3:a:cockpit-project:cockpit:*:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

4.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.24%
Probability of exploitation in next 30 days
EPSS Percentile
66.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0124 is in the 79th percentile among its peer group of 26,220 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 18895-16820Fixed in: -
microsoftpatch availablevia msrc
Product: cm1 cockpit 248-3 on CBL Mariner 1.0Fixed in: -
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: cockpit-0:264.1-1.el8
View patch
redhatno patchvia redhat_api
Product: Red Hat Virtualization 4Fixed in: cockpit

Vendor Advisories (2)

microsoft2022-Mar/CVE-2021-3660Moderate

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.

Mar 8, 2022
redhatCVE-2021-3660Low

cockpit: pages vulnerable to clickjacking

Jul 20, 2021

References

bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party Advisory
github.com / cockpit-project/cockpit/commit/8d9bc10d8128aae03dfde62fd00075fe492ead10
PatchThird Party Advisory
github.com / cockpit-project/cockpit/issues/16122
PatchThird Party Advisory