CVE-2020-2109Network attack vector

Authenticated code execution via unchecked default expressions

Published Feb 12, 2020 · Updated Aug 4, 2024

Sandbox bypass in Jenkins Pipeline: Groovy Plugin 2.78 and earlier allows remote authenticated users to execute controller-JVM code. Default parameter expressions in CPS-transformed methods execute without the sandbox checks that should constrain untrusted Pipeline code. The user must be able to define and run a sandboxed Pipeline; successful exploitation executes arbitrary code with the controller process's privileges.

CVSS severity8.8
High
EPSS probability1.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox bypass in Jenkins Pipeline: Groovy Plugin 2.78 and earlier allows remote authenticated users to execute controller-JVM code. Default parameter expressions in CPS-transformed methods execute without the sandbox checks that should constrain untrusted Pipeline code. The user must be able to define and run a sandboxed Pipeline; successful exploitation executes arbitrary code with the controller process's privileges.

The record

CVE
CVE-2020-2109
Published
Feb 12, 2020
Updated
Aug 4, 2024
Vendor
Jenkins Project
Product
Pipeline: Groovy
Classifications
CWE-20, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 12, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=2.78

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jenkins Project · Pipeline: Groovyversion=unspecified <=2.78

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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