CVE-2021-21673

6.1 mediumEPSS 1.6%

Medium (6.1) in jenkins cas. EPSS 1.6% chance of exploitation in the next 30 days. Fixed in org.jenkins-ci.plugins:cas-plugin 1.6.1.

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.

Severity

CVSS 3.1

6.1 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 1.6% chance of exploitation in the next 30 days; higher than 75% of CVEs (scores of 2026-10-31)
Published: 2021-06-30
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

jenkins:cas

Packages (OSV)

Advisory	Ecosystem	Package	Affected	Fixed in
GHSA-2vvr-5757-qp87	Maven	org.jenkins-ci.plugins:cas-plugin	<1.6.1	1.6.1

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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