What’s Vulnerable › Vulnerabilities

CVE-2021-21671

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-30 · updated 2026-06-17

Description

Jenkins 2.299 and earlier, LTS 2.289.1 and earlier does not invalidate the previous session on login.

Affected products

• Jenkins: from 2.266 before 2.300; from 2.277.1 before 2.289.2 — fixed in 2.289.2, 2.300

How to fix

Upgrade to a fixed version: Jenkins 2.289.2, 2.300. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2021/06/30/1
• https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2371
• http://www.openwall.com/lists/oss-security/2021/06/30/1
• https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2371

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