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CVE-2021-21620

17
FAUCET Score

CVE-2021-21620 describes a Cross-Site Request Forgery (CSRF) vulnerability in Jenkins Claim Plugin versions 2.18.1 and earlier, allowing unauthenticated attackers to modify claims. Rated as Medium severity with a CVSS score of 4.3, this vulnerability requires user interaction (UI:R) but has low attack complexity (AC:L) and could lead to low integrity impact (I:L). There is currently no evidence of active exploitation, nor are there publicly available exploit modules in Metasploit, Nuclei, or ExploitDB, and it has received minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2.18.1CPE matchmatch criteria
cpe:2.3:a:jenkins:claim:*:*:*:*:*:jenkins:*:*

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
1.64%
Probability of exploitation in next 30 days
EPSS Percentile
73.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0163 is in the 86th percentile among its peer group of 26,236 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 (2)

mavenpatch availablevia ghsa
Product: org.jenkins-ci.plugins:claimFixed in: 2.18.2
jenkinsvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

mavenGHSA-4ffq-6g62-j4v4medium

Cross-Site Request Forgery in the Jenkins Claim plugin

Jun 16, 2021

References

jenkins.io / security/advisory/2021-02-24
Vendor Advisory