CVE-2021-21603 : Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not escape notification

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not escape notification bar response contents, resulting in a cross-site scripting (XSS) vulnerability.

Published 2021-01-13 16:15:13

Updated 2023-11-02 22:10:01

Source Jenkins Project

View at NVD, CVE.org

Vulnerability category: Cross site scripting (XSS)

Products affected by CVE-2021-21603

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-2021-21603

Top countries where our scanners detected CVE-2021-21603

Top open port discovered on systems with this issue 80

IPs affected by CVE-2021-21603 18,499

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2021-21603!

^*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-2021-21603

EPSS FAQ

0.32%

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

~ 52 %

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

CVSS scores for CVE-2021-21603

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-2021-21603

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-2021-21603

https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-1889

Jenkins Security Advisory 2021-01-13
Vendor Advisory