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CVE-2021-21673

21
FAUCET Score

CVE-2021-21673 is a medium-severity phishing vulnerability affecting Jenkins CAS Plugin versions 1.6.0 and earlier. It allows attackers to craft malicious redirect URLs after login, potentially leading to phishing attacks against users. The vulnerability has a CVSS score of 6.1, indicating a network-based attack with low complexity requiring user interaction, resulting in low confidentiality and integrity impacts. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.6.0CPE matchmatch criteria
cpe:2.3:a:jenkins:cas:*:*:*:*:*:jenkins:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.58%
Probability of exploitation in next 30 days
EPSS Percentile
73.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0158 is in the 85th percentile among its peer group of 26,221 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

mavenpatch availablevia ghsa
Product: org.jenkins-ci.plugins:cas-pluginFixed in: 1.6.1
jenkinsvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

mavenGHSA-2vvr-5757-qp87medium

Open redirect vulnerability in Jenkins CAS Plugin

May 24, 2022

References

jenkins.io / security/advisory/2021-06-30
Vendor Advisory
openwall.com / lists/oss-security/2021/06/30/1
Mailing ListThird Party Advisory