CVE-2021-21686: jenkins project jenkins
Vulnerability summary
CVE-2021-21686 is a high (CVSS 8.1) vulnerability in jenkins project jenkins. EPSS estimates a 1.98% chance of exploitation in the next 30 days, higher than 80.5% of scored vulnerabilities.
Not severe (CVSS 8.1, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 6Timeline
- 04-11-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
File path filters in the agent-to-controller security subsystem of Jenkins 2.318 and earlier, LTS 2.303.2 and earlier do not canonicalize paths, allowing operations to follow symbolic links to outside allowed directories.
CVSS metrics
3 scores · 2 sources · 2 versions- OSV · MavenEcosystem advisory · calculated9.0CriticalCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:HDiffers
EPSS trend
Probability
1.98%
Chance of exploitation in the next 30 days
Percentile
81%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.98% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.
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
6 links
- github.com/jenkinsci/jenkinsPACKAGE