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Fencer Vulns
high 8.8

CVE-2021-43405 in the critical feed json

An issue was discovered in FusionPBX before 4.5.30.

published 2021-11-05 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-30340

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
35.6%
EPSS 35.6% chance of exploitation in 30 days, percentile 98%
public exploits
1
Exploit-DB

Summary

An issue was discovered in FusionPBX before 4.5.30. The fax_extension may have risky characters (it is not constrained to be numeric).

Patch / fix

  • fusionpbx fusionpbx 4.5.30

Timeline

  1. Published
  2. First public exploit (EDB-50505)

Exploit prediction

35.63% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-50505 FusionPBX 4.5.29 - Remote Code Execution (RCE) (Authenticated) webapps, 2021-11-08
  • packetstormsecurity.com http://packetstormsecurity.com/files/164795/FusionPBX-4.5.29-Remote-Code-Execution.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.