What’s Vulnerable › Vulnerabilities

CVE-2021-21673

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.6% 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 CAS Plugin 1.6.0 and earlier improperly determines that a redirect URL after login is legitimately pointing to Jenkins, allowing attackers to perform phishing attacks.

Affected products

• Jenkins Project Jenkins CAS Plugin: through 1.6.0

References

• http://www.openwall.com/lists/oss-security/2021/06/30/1
• https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2387
• http://www.openwall.com/lists/oss-security/2021/06/30/1
• https://www.jenkins.io/security/advisory/2021-06-30/#SECURITY-2387

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