CVE-2021-21608 : Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not escape button labels

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not escape button labels in the Jenkins UI, resulting in a cross-site scripting (XSS) vulnerability exploitable by attackers with the ability to control button labels.

Published 2021-01-13 16:15:14

Updated 2023-11-02 22:04:14

Source Jenkins Project

View at NVD, CVE.org

Vulnerability category: Cross site scripting (XSS)

Products affected by CVE-2021-21608

Jenkins » Jenkins » LTS Edition
Versions up to, including, (<=) 2.263.1
cpe:2.3:a:jenkins:jenkins:*:*:*:*:lts:*:*:*
Matching versions
Jenkins » Jenkins »
Versions up to, including, (<=) 2.274
cpe:2.3:a:jenkins:jenkins:*:*:*:*:-:*:*:*
Matching versions

Threat overview for CVE-2021-21608

Top countries where our scanners detected CVE-2021-21608

Top open port discovered on systems with this issue 80

IPs affected by CVE-2021-21608 17,022

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2021-21608!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2021-21608

EPSS FAQ

0.05%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 20 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-21608

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
3.5	LOW	AV:N/AC:M/Au:S/C:N/I:P/A:N	6.8	2.9	NIST
Access Vector: Network Access Complexity: Medium Authentication: Single Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
5.4	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N	2.3	2.7	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: Low User Interaction: Required Scope: Changed Confidentiality: Low Integrity: Low Availability: None

CWE ids for CVE-2021-21608

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Assigned by:
- jenkinsci-cert@googlegroups.com (Secondary)
- nvd@nist.gov (Primary)

References for CVE-2021-21608

https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2035

Jenkins Security Advisory 2021-01-13
Vendor Advisory