CVE-2021-21646

Remote code execution vulnerability in Jenkins Templating Engine Plugin

8.8 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

1.75%Up 0.7 points since Apr 27, 2021

What each source reports

NVD Score used 8.8

Record: CVE-2021-21646
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 6.5 MediumAV:N/AC:L/Au:S/C:P/I:P/A:P
Updated: 2026-11-02

CVE List No score

Record: CVE-2021-21646
Updated: 2026-11-02

EUVDEUVD-2022-4698 No score

Record: EUVD-2022-4698
Updated: 2026-11-03

GitHub AdvisoriesGHSA-p6qc-37hq-wqr6 8.8

Remote code execution vulnerability in Jenkins Templating Engine Plugin

Jenkins Templating Engine Plugin 2.1 and earlier does not protect its pipeline configurations using Script Security Plugin.

This vulnerability allows attackers with Job/Configure permission to execute arbitrary code in the context of the Jenkins controller JVM.

Jenkins Templating Engine Plugin 2.2 integrates with Script Security Plugin to protect its pipeline configurations.

Record: GHSA-p6qc-37hq-wqr6
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-693
Updated: 2026-11-02

OSV 8.8

Record: CVE-2021-21646
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVGHSA-p6qc-37hq-wqr6 8.8

Remote code execution vulnerability in Jenkins Templating Engine Plugin

Jenkins Templating Engine Plugin 2.1 and earlier does not protect its pipeline configurations using Script Security Plugin.

This vulnerability allows attackers with Job/Configure permission to execute arbitrary code in the context of the Jenkins controller JVM.

Jenkins Templating Engine Plugin 2.2 integrates with Script Security Plugin to protect its pipeline configurations.

Record: GHSA-p6qc-37hq-wqr6
CVSS 3.1: 8.8 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-693
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`org.jenkins-ci.plugins:templating-engine` Maven	through 2.1	2.2
`org.jenkins-ci.plugins:templating-engine` Maven	before 2.2, plus listed versions 1.01.11.1.11.21.3 Show 17 moreShow less 1.41.4.11.4.21.51.5.11.5.21.61.71.7.12.02.0-alpha2.0-alpha22.0.12.0.22.0.32.0.42.1	2.2

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-21646 is a high vulnerability (CVSS 8.8) in Jenkins Templating Engine, published April 21, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.75%, the 77th percentile. Fixed in org.jenkins-ci.plugins:templating-engine 2.2.