Home/CVE/Jenkins 2.286 and earlier, LTS 2.277.1 and earlier does not validate the type of object created after loading the data s
CVE

CVE-2021-21639

Jenkins 2.286 and earlier, LTS 2.277.1 and earlier does not validate the type of object created after loading the data s

Jenkins 2.286 and earlier, LTS 2.277.1 and earlier does not validate the type of object created after loading the data submitted to the config.xml REST API endpoint of a node, allowing attackers with Computer/Configure permission to replace a node with one of a different type.

MEDIUM · CVSS 4.3 EPSS 0.00703
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  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
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Affected Products & Versions

2
jenkins<= 2.277.1
jenkins<= 2.286
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Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Maven org.jenkins-ci.main:jenkins-core MODERATE fixed in 2.277.2
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Scoring & Timeline

4.3
MEDIUM · CVSS v3.1 · jenkinsci-cert@googlegroups.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD07 Apr 2021 · 02:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
⚑

Vendor Advisories

2
rhsaRHSA-2021:2437Moderate
rhsaRHSA-2021:1551Low
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.openwall.com/lists/oss-security/2021/04/07/2Mailing ListThird Party Advisory
https://www.jenkins.io/security/advisory/2021-04-07/#SECURITY-1721Vendor Advisory
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