6.1

CVE-2021-21610: jenkins project jenkins Cross-site Scripting

CVSS: 6.1v3.1MediumModified
AliasesGHSA-7qf3-c2q8-69m3BIT-jenkins-2021-21610
Published 13-01-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-21610 is a medium (CVSS 6.1) Cross-site Scripting vulnerability in jenkins project jenkins. EPSS estimates a 1.20% chance of exploitation in the next 30 days, higher than 67.7% of scored vulnerabilities.

Overall risk
25/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.1/10
010
Medium · v3.1 (NVD)
EPSS score
1.20%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4
RHSA-2021:0423RHSA-2021:0429RHSA-2021:0637RHSA-2021:2437

Timeline

  1. 13-01-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not implement any restrictions for the URL rendering a formatted preview of markup passed as a query parameter, resulting in a reflected cross-site scripting (XSS) vulnerability if the configured markup formatter does not prohibit unsafe elements (JavaScript) in markup.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.20%

Chance of exploitation in the next 30 days

Percentile

68%

Versus all other CVEs

30-day change

+0.01 pp

From 1.19% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.20%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Jenkins1 product
Jenkins project1 product
  • jenkins≥ unspecified, ≤ 2.274 | ≥ unspecified, ≤ LTS 2.263.1
Org.jenkins-ci.main1 product
  • jenkins-core< 2.263.2 | ≥ 2.264, < 2.275

3 vendors · 3 products

References

4 links