CVE-2021-43405
HIGHCVSS 8.8/10EPSS 35.63%
Last modified
CVE-2021-43405 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. An issue was discovered in FusionPBX before 4.5.30. The fax_extension may have risky characters (it is not constrained to be numeric).. EPSS estimates a 35.63% chance of exploitation in the next 30 days.
Description
An issue was discovered in FusionPBX before 4.5.30. The fax_extension may have risky characters (it is not constrained to be numeric).
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Fusionpbx | Fusionpbx | < 4.5.30 |
References
- http://packetstormsecurity.com/files/164795/FusionPBX-4.5.29-Remote-Code-Execution.htmlExploit, Third Party Advisory
- https://github.com/fusionpbx/fusionpbx/commit/2d2869c1a1e874c46a8c3c5475614ce769bbbd59Patch, Third Party Advisory
- http://packetstormsecurity.com/files/164795/FusionPBX-4.5.29-Remote-Code-Execution.htmlExploit, Third Party Advisory
- https://github.com/fusionpbx/fusionpbx/commit/2d2869c1a1e874c46a8c3c5475614ce769bbbd59Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-43405?
An issue was discovered in FusionPBX before 4.5.30. The fax_extension may have risky characters (it is not constrained to be numeric).
How severe is CVE-2021-43405?
CVE-2021-43405 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 35.63% probability of exploitation in the next 30 days.
How do I fix CVE-2021-43405?
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-2021-43405?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST