CVE-2020-2123Network attack vector

Authenticated code execution via unsafe YAML deserialization

Published Feb 12, 2020 · Updated Aug 4, 2024

Unsafe YAML deserialization in Jenkins RadarGun Plugin 1.7 and earlier allows remote authenticated users to execute arbitrary code. YamlNodeConfigParser constructs SnakeYAML with the unrestricted default constructor, allowing build-step node-list YAML to instantiate attacker-chosen Java types. A user must be able to configure and run the RadarGun build step, after which code executes in the Jenkins controller process.

CVSS severity8.8
High
EPSS probability2.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe YAML deserialization in Jenkins RadarGun Plugin 1.7 and earlier allows remote authenticated users to execute arbitrary code. YamlNodeConfigParser constructs SnakeYAML with the unrestricted default constructor, allowing build-step node-list YAML to instantiate attacker-chosen Java types. A user must be able to configure and run the RadarGun build step, after which code executes in the Jenkins controller process.

The record

CVE
CVE-2020-2123
Published
Feb 12, 2020
Updated
Aug 4, 2024
Vendor
Jenkins Project
Product
RadarGun Plugin
Classifications
CWE-502, T1190
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 <=1.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jenkins Project · RadarGun Pluginversion=unspecified <=1.7

Published CVSS scores

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

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-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

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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