CVE-2021-3660Network attack vector

Clickjacking via missing frame restrictions

Published Mar 7, 2022 · Updated Aug 3, 2024

Clickjacking in Cockpit Project Cockpit before 254 allows remote attackers to alter displayed interface actions via cross-origin iframe embedding. Cockpit HTTP responses omitted an X-Frame-Options sameorigin policy, so a malicious site could load the administration page inside an iframe and overlay deceptive controls. Exploitation requires a victim to visit the attacker-controlled page and interact with the framed interface; the documented impact is integrity loss through tricked actions, not confidentiality or service interruption.

CVSS severity4.3
Medium
EPSS probability1.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Clickjacking in Cockpit Project Cockpit before 254 allows remote attackers to alter displayed interface actions via cross-origin iframe embedding. Cockpit HTTP responses omitted an X-Frame-Options sameorigin policy, so a malicious site could load the administration page inside an iframe and overlay deceptive controls. Exploitation requires a victim to visit the attacker-controlled page and interact with the framed interface; the documented impact is integrity loss through tricked actions, not confidentiality or service interruption.

The record

CVE
CVE-2021-3660
Published
Mar 7, 2022
Updated
Aug 3, 2024
Vendor
Cockpit Project
Product
Cockpit
Classifications
CWE-1021, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 7, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Fixed in cockpit v254 and later.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cockpit Project · Cockpitversion=Fixed in cockpit v254 and later.

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
4.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1021Improper Restriction of Rendered UI Layers or Frames
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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