CVE-2021-21684

mediumpriority · track · 24EPSS 0.012 · 69 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.24% (69th) EPSS

CVSS 4.3 · medium

Is it mine?

6 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · cert_bund · nvd

EPSS · scored 2026-10-27

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

Technical severity, 0–10. One row per scoring source.

6.1

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 2.7

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · OSV

v3.15.6mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-116USprimaryCWE-116USCWE-79US

affected products (6)

Products and version ranges known to be affected.

Jenkins Jenkins Pluginsall versionscert_bundDEcpe:/a:cloudbees:jenkins:plugins
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Red Hat OpenShift Container Platform 4.12all versionscert_bundDEcpe:/a:redhat:openshift:container_platform_4.12
Jenkins Project Jenkins Git Plugin≤ unspecified ≤4.8.2enisa_euvdEU
jenkins git≤ 4.8.2nvdUScpe:2.3:a:jenkins:git:*:*:*:*:*:*:*:*
Maven org.jenkins-ci.plugins:git< 4.8.3osvUSpkg:maven/org.jenkins-ci.plugins/git

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2023-0432Jenkins: Mehrere SchwachstellenDeutsch2021-10-06csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Jenkins ausnutzen, um Sicherheitsvorkehrungen zu umgehen, Dateien zu manipulieren oder einen Cross-Site-Scripting-Angriff durchzuführen.
GHSA-gghc-g8cj-4vfvStored XSS vulnerability in Jenkins Git Plugin2022-05-24ghsa · osvUS
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. This results in a stored cross-site scripting (XSS) vulnerability exploitable by attackers able to submit crafted commit notifications to the `/git/notifyCommit` endpoint. Jenkins Git Plugin 4.8.3 rejects Git SHA-1 checksum parameters that do not match the expected format. Existing values are sanitized when displayed on the UI. This vulnerability is only exploitable in Jenkins 2.314 and earlier, LTS 2.303.1 and earlier. See the [LTS upgrade guide](https://www.jenkins.io/doc/upgrade-guide/2.303/#SECURITY-2452).

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund nvd osv NVD CVE.org MITRE

published 2021-10-06modified 2026-06-17

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references (16)

External citations — patches, advisories, analysis.

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