CVE-2021-39947
HIGHCVSS 7.5/10EPSS 0.79%
Last modified
CVE-2021-39947 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In specific circumstances, trace file buffers in GitLab Runner versions up to 14.3.4, 14.4 to 14.4.2, and 14.5 to 14.5.2 would re-use the file descriptor 0 for multiple traces and mix the output of several jobs. EPSS estimates a 0.79% chance of exploitation in the next 30 days.
Description
In specific circumstances, trace file buffers in GitLab Runner versions up to 14.3.4, 14.4 to 14.4.2, and 14.5 to 14.5.2 would re-use the file descriptor 0 for multiple traces and mix the output of several jobs
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Gitlab | Gitlab Runner | < 14.3.4 |
| Gitlab | Gitlab Runner | >= 14.4.0, < 14.4.2 |
| Gitlab | Gitlab Runner | >= 14.5.0, < 14.5.2 |
References
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39947.jsonPatch, Third Party Advisory
- https://gitlab.com/gitlab-org/cves/-/blob/master/2021/CVE-2021-39947.jsonPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-39947?
In specific circumstances, trace file buffers in GitLab Runner versions up to 14.3.4, 14.4 to 14.4.2, and 14.5 to 14.5.2 would re-use the file descriptor 0 for multiple traces and mix the output of several jobs
How severe is CVE-2021-39947?
CVE-2021-39947 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.79% probability of exploitation in the next 30 days.
How do I fix CVE-2021-39947?
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.
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Are you affected by CVE-2021-39947?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST