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CVE-2021-21684

21
FAUCET Score

CVE-2021-21684 is a stored cross-site scripting (XSS) vulnerability affecting Jenkins Git Plugin versions 4.8.2 and earlier. The vulnerability arises because the plugin fails to properly escape Git SHA-1 checksum parameters when displaying them in build causes. This medium-severity vulnerability has a CVSS score of 6.1, indicating it can be exploited remotely with low attack complexity, requiring user interaction, and potentially leading to low impact on confidentiality and integrity. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.8.2CPE matchmatch criteria
cpe:2.3:a:jenkins:git:*:*:*:*:*:jenkins:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.20%
Probability of exploitation in next 30 days
EPSS Percentile
64.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0120 is in the 78th percentile among its peer group of 26,234 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 (3)

mavenpatch availablevia ghsa
Product: org.jenkins-ci.plugins:gitFixed in: 4.8.3
redhatpatch availablevia redhat_api
Product: Red Hat OpenShift Container Platform 4.10Fixed in: jenkins-2-plugins-0:4.10.1643404185-1.el8
View patch
jenkinsvendor investigatingvia nvd_reference
View patch

Vendor Advisories (2)

mavenGHSA-gghc-g8cj-4vfvmedium

Stored XSS vulnerability in Jenkins Git Plugin

May 24, 2022
redhatCVE-2021-21684Moderate

jenkins-2-plugins/git: stored XSS vulnerability

Oct 6, 2021

References

jenkins.io / security/advisory/2021-10-06
Vendor Advisory
openwall.com / lists/oss-security/2021/10/06/1
Mailing ListThird Party Advisory