CVE-2021-39873
MEDIUMCVSS 4.3/10EPSS 0.88%
Last modified
CVE-2021-39873 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. In all versions of GitLab CE/EE, there exists a content spoofing vulnerability which may be leveraged by attackers to trick users into visiting a malicious website by spoofing the content in an error response.. EPSS estimates a 0.88% chance of exploitation in the next 30 days.
Description
In all versions of GitLab CE/EE, there exists a content spoofing vulnerability which may be leveraged by attackers to trick users into visiting a malicious website by spoofing the content in an error response.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Gitlab | Gitlab | >= 1.0.0, < 14.1.7 |
| Gitlab | Gitlab | >= 14.2.0, < 14.2.5 |
| Gitlab | Gitlab | 4.3.0 |
References
- https://hackerone.com/reports/504961Permissions Required, Third Party Advisory
- https://hackerone.com/reports/504961Permissions Required, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-39873?
In all versions of GitLab CE/EE, there exists a content spoofing vulnerability which may be leveraged by attackers to trick users into visiting a malicious website by spoofing the content in an error response.
How severe is CVE-2021-39873?
CVE-2021-39873 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.88% probability of exploitation in the next 30 days.
How do I fix CVE-2021-39873?
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-2021-39873?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST