CVE-2021-43405
An issue was discovered in FusionPBX before 4.5.30. The fax_extension may have risky characters ...
An issue was discovered in FusionPBX before 4.5.30. The fax_extension may have risky characters (it is not constrained to be numeric).
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in FusionPBX before 4.5.30. The fax_extension may have risky characters (it is not constrained to be numeric).
- Record
CVE-2021-43405- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.5 Medium
AV:N/AC:L/Au:S/C:P/I:P/A:P - Updated
- 2026-11-02
CVE List No score
An issue was discovered in FusionPBX before 4.5.30. The fax_extension may have risky characters (it is not constrained to be numeric).
- Record
CVE-2021-43405- Updated
- 2026-11-02
EUVDEUVD-2021-30340 No score
An issue was discovered in FusionPBX before 4.5.30. The fax_extension may have risky characters (it is not constrained to be numeric).
- Record
EUVD-2021-30340- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-42c2-hjwj-v6gj
An issue was discovered in FusionPBX before 4.5.30. The fax_extension may have risky characters ...
An issue was discovered in FusionPBX before 4.5.30. The fax_extension may have risky characters (it is not constrained to be numeric).
- Record
GHSA-42c2-hjwj-v6gj- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-20
- Updated
- 2026-11-02
OSV
An issue was discovered in FusionPBX before 4.5.30. The fax_extension may have risky characters (it is not constrained to be numeric).
- Record
CVE-2021-43405- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | FusionPBX 4.5.29 - Remote Code Execution (RCE) (Authenticated) | 2021-11-08 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-43405 is a high vulnerability (CVSS 8.8) in Fusionpbx, published November 5, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 35.6%, the 98th percentile. No source names a fixed version.