CVE-2021-21686
HIGHCVSS 8.1/10EPSS 1.91%
Last modified
CVE-2021-21686 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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.. EPSS estimates a 1.91% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Jenkins | Jenkins | < 2.303.3 |
| Jenkins | Jenkins | < 2.319 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-21686?
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.
How severe is CVE-2021-21686?
CVE-2021-21686 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 1.91% probability of exploitation in the next 30 days.
How do I fix CVE-2021-21686?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2021
- CVE-2021-21680Jenkins Nested View Plugin 1.20 and earlier does not configu…7.1
- CVE-2021-21681Jenkins Nomad Plugin 0.7.4 and earlier stores Docker passwor…5.5
- CVE-2021-21682Jenkins 2.314 and earlier, LTS 2.303.1 and earlier accepts n…4.3
- CVE-2021-21683The file browser in Jenkins 2.314 and earlier, LTS 2.303.1 a…6.5
- CVE-2021-21684Jenkins Git Plugin 4.8.2 and earlier does not escape the Git…6.1
- CVE-2021-21685Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not …9.1
- CVE-2021-21687Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not …9.1
- CVE-2021-21688The agent-to-controller security check FilePath#reading(File…7.5
- CVE-2021-21689FilePath#unzip and FilePath#untar were not subject to any ag…9.1
- CVE-2021-2169Vulnerability in the MySQL Server product of Oracle MySQL (c…4.9
- CVE-2021-21690Agent processes are able to completely bypass file path filt…9.8
- CVE-2021-21691Creating symbolic links is possible without the 'symlink' ag…9.8
Are you affected by CVE-2021-21686?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST