What’s Vulnerable › Vulnerabilities

CVE-2021-21690

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-04 · updated 2026-06-17
• Weakness: CWE-22

Description

Agent processes are able to completely bypass file path filtering by wrapping the file operation in an agent file path in Jenkins 2.318 and earlier, LTS 2.303.2 and earlier.

Affected products

• Jenkins: before 2.303.3; before 2.319 — fixed in 2.303.3, 2.319

How to fix

Upgrade to a fixed version: Jenkins 2.303.3, 2.319. Check the vendor advisory for mitigations.

References

• https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455
• https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2455

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