Jenkins Templating Engine Plugin 2.1 and earlier does not protect its pipeline configurations using Script Security Plugin, allowing attackers with Job/Configure permission to execute arbitrary code in the context of the Jenkins controller JVM.
CVE-2021-21646
HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence
This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 40% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 8.8Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 8.8
- EG Score
- 8.8(medium)
- EPSS
- 75.2%
- KEV
- Not listed
Published
April 21, 2021
Last Modified
November 21, 2024
References (4)
- jenkinsci-cert@googlegroupshttp://www.openwall.com/lists/oss-security/2021/04/21/2
- jenkinsci-cert@googlegroupshttps://www.jenkins.io/security/advisory/2021-04-21/#SECURITY-2311
- af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/04/21/2
- af854a3a-2127-422b-91ae-364da2661108https://www.jenkins.io/security/advisory/2021-04-21/#SECURITY-2311
Frequently asked(5)
What is CVE-2021-21646?
CVE-2021-21646 is a high vulnerability published on April 21, 2021. Jenkins Templating Engine Plugin 2.1 and earlier does not protect its pipeline configurations using Script Security Plugin, allowing attackers with Job/Configure permission to execute arbitrary code in the context of the Jenkins controller JVM.
When was CVE-2021-21646 disclosed?
CVE-2021-21646 was first published in the National Vulnerability Database on April 21, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-21646 actively exploited?
CVE-2021-21646 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 75.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-21646?
CVE-2021-21646 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2021-21646?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-21646, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2021-21646
Is Your Infrastructure Affected by CVE-2021-21646?
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