CVE-2021-21691: jenkins project jenkins Link Following
CVSS: 9.8v3.1CriticalModified
AliasesGHSA-2c79-h2h5-g3fwBIT-jenkins-2021-21691
Published 04-11-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-21691 is a critical (CVSS 9.8) Link Following vulnerability in jenkins project jenkins. EPSS estimates a 2.10% chance of exploitation in the next 30 days, higher than 81.4% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (NVD)EPSS score
2.10%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 6Timeline
- 04-11-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
Creating symbolic links is possible without the 'symlink' agent-to-controller access control permission in Jenkins 2.318 and earlier, LTS 2.303.2 and earlier.
CVSS metrics
3 scores · 2 sources · 2 versionsCritical 9.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSources2 sources · 9.0–9.8
- OSV · MavenEcosystem advisory · calculated9.0CriticalCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:HDiffers
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
2.10%
Chance of exploitation in the next 30 days
Percentile
81%
Versus all other CVEs
30-day change
0.00 pp
From 2.10% on 20-09-2026
20-09-202620-10-2026
EPSS score2.10%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Jenkins1 product
- jenkins< 2.303.3 | < 2.319
Jenkins project1 product
- jenkins≥ unspecified, ≤ 2.318 | ≥ unspecified, ≤ LTS 2.303.2
Org.jenkins-ci.main1 product
- jenkins-core< 2.303.3 | ≥ 2.304, < 2.319
3 vendors · 3 products
References
4 links
- github.com/jenkinsci/jenkinsPACKAGE