CVE-2021-21684: jenkins project jenkins git plugin Improper Encoding or Escaping of Output
Vulnerability summary
CVE-2021-21684 is a medium (CVSS 6.1) Improper Encoding or Escaping of Output vulnerability in jenkins project jenkins git plugin. EPSS estimates a 1.24% chance of exploitation in the next 30 days, higher than 69.2% of scored vulnerabilities.
Not severe (CVSS 6.1, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 1Timeline
- 06-10-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
Jenkins Git Plugin 4.8.2 and earlier does not escape the Git SHA-1 checksum parameters provided to commit notifications when displaying them in a build cause, resulting in a stored cross-site scripting (XSS) vulnerability.
CVSS metrics
3 scores · 2 sources · 2 versions- OSV · MavenEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS trend
Probability
1.24%
Chance of exploitation in the next 30 days
Percentile
69%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.24% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.
Jenkins1 product
- git≤ 4.8.2
Jenkins project1 product
- jenkins git plugin≥ unspecified, ≤ 4.8.2
Org.jenkins-ci.plugins1 product
- git< 4.8.3
3 vendors · 3 products
References
5 links- www.openwall.com/lists/oss-security/2021/10/06/1Mailing ListX Refsource MLISTWEBThird Party Advisory
