What’s Vulnerable › Vulnerabilities

CVE-2021-21615

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-01-26 · updated 2026-06-17
• Weakness: CWE-367

Description

Jenkins 2.275 and LTS 2.263.2 allows reading arbitrary files using the file browser for workspaces and archived artifacts due to a time-of-check to time-of-use (TOCTOU) race condition.

Affected products

• Jenkins: before 2.263.3; before 2.276 — fixed in 2.263.3, 2.276

How to fix

Upgrade to a fixed version: Jenkins 2.263.3, 2.276. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2021/01/26/2
• https://www.jenkins.io/security/advisory/2021-01-26/#SECURITY-2197
• http://www.openwall.com/lists/oss-security/2021/01/26/2
• https://www.jenkins.io/security/advisory/2021-01-26/#SECURITY-2197

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