Exploitation Summary
EIP tracks 1 public exploit for CVE-2021-43405. PoCs published by Luska.
AI-analyzed exploit summary This exploit leverages a command injection vulnerability in FusionPBX's fax_send.php by injecting a command into the 'fax_extension' parameter. It requires authentication and uses a multipart form to bypass input validation.
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).
Exploits (1)
exploitdb
WORKING POC
by Luska · pythonwebappsphp
https://www.exploit-db.com/exploits/50505
This exploit leverages a command injection vulnerability in FusionPBX's fax_send.php by injecting a command into the 'fax_extension' parameter. It requires authentication and uses a multipart form to bypass input validation.
Classification
Working Poc 95%
Attack Type
Rce
Complexity
Trivial
Reliability
Reliable
Target:
FusionPBX < 4.5.30
Auth required
Prerequisites:
Valid credentials for FusionPBX · Access to the fax_send.php endpoint
devstral-2 · analyzed Feb 16, 2026
Full analysis →
References (2)
Core 2
Core References
Patch, Third Party Advisory x_refsource_misc
https://github.com/fusionpbx/fusionpbx/commit/2d2869c1a1e874c46a8c3c5475614ce769bbbd59
Exploit, Third Party Advisory x_refsource_misc
http://packetstormsecurity.com/files/164795/FusionPBX-4.5.29-Remote-Code-Execution.html
Scores
CVSS v3
8.8
EPSS
0.3563
EPSS Percentile
98.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details
Status
published
Products (1)
fusionpbx/fusionpbx
< 4.5.30
Published
Nov 05, 2021
Tracked Since
Feb 18, 2026