CVE-2021-21673 json
Open redirect vulnerability in Jenkins CAS Plugin
published 2021-06-30 5 y ago modified 2026-06-17 4 mo ago also GHSA-2vvr-5757-qp87 , EUVD-2022-2055
- cvss
- 6.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.6%
- EPSS 1.6% chance of exploitation in 30 days, percentile 75%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
Exploit prediction
1.58% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD | 2.0 | 5.8 | AV:N/AC:M/Au:N/C:P/I:P/A:N |
| GitHub | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | org.jenkins-ci.plugins:cas-plugin | <1.6.1 |
1.6.1 |
Affected products
- Jenkins project Jenkins CAS Plugin
Classification
- Weakness
-
- CWE-601 URL Redirection to Untrusted Site
References
-
github.com
/jenkinsci/cas-plugin/commit/8ac536a953156160dbabb61bdb3b9bc75c3d0ef9
web
-
jenkins.io
/security/advisory/2021-06-30/#SECURITY-2387
web, vendor-advisory
-
openwall.com
/lists/oss-security/2021/06/30/1
mailing-list, web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-21673
advisory
-
github.com
/jenkinsci/cas-plugin
package
Sources
- CVE List CVE-2021-21673
- GitHub Advisory GHSA-2vvr-5757-qp87
- NVD CVE-2021-21673
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.