Home/CVE/File path filters in the agent-to-controller security subsystem of Jenkins 2.318 and earlier, LTS 2.303.2 and earlier do
CVE

CVE-2021-21686

File path filters in the agent-to-controller security subsystem of Jenkins 2.318 and earlier, LTS 2.303.2 and earlier do

File path filters in the agent-to-controller security subsystem of Jenkins 2.318 and earlier, LTS 2.303.2 and earlier do not canonicalize paths, allowing operations to follow symbolic links to outside allowed directories.

HIGH · CVSS 8.1 EPSS 0.00506
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-59Improper Link Resolution Before File Access ('Link Following')
▤

Affected Products & Versions

2
jenkins< 2.303.3
jenkins< 2.319
▤

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 CRITICAL fixed in 2.303.3
▣

Scoring & Timeline

8.1
HIGH · 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 NVD04 Nov 2021 · 05:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
⚑

Vendor Advisories

5
rhsaRHSA-2021:4827Important
rhsaRHSA-2021:4829Important
rhsaRHSA-2021:4801Important
rhsaRHSA-2021:4799Important
rhsaRHSA-2021:4833Important
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455Vendor Advisory
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