November 13, 2026

CVE Watchtower

CVE-2026-95377Zenitel VSFF6 OS Command Injection

NVD

Vulnerability Summary

OS command injection in the TFTP provisioning module of Zenitel EdgeAudioClient before 9.6.3.0, and 10.x before 10.1.3.0, on VSFF6, VSFF8, VSFF8MP, VSFF8MN, and VSFT devices allows unauthenticated adjacent attackers to execute arbitrary commands as root via a crafted DHCP option 66 (TFTP Server Name) value supplied by a rogue DHCP server on the same network segment. The DHCP-supplied value is passed to a shell without sanitization. Devices using DHCP, the default configuration, are affected on every boot and lease renewal.



The same injection is also reachable via the config_update_tftp_server and sw_update_tftp_server configuration fields by an attacker able to modify the device configuration.
Severity Level
CRITICAL(9.4)
Published Date
Nov 13, 2026
Last Modified
Nov 13, 2026
Exploitation Status
No confirmed exploitation yet
Root Weakness (CWE)
CWE-78: OS Command Injection β†—
The software constructs all or part of an OS command using externally-influenced input, but does not properly neutralize special elements.
CVSS v4.0 Base Metrics — Score 9.4 (CRITICAL)
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/S:P/AU:Y
Attack VectorAdjacent
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredNone
User InteractionNone
Confidentiality (Vulnerable System)High
Integrity (Vulnerable System)High
Availability (Vulnerable System)High
Confidentiality (Subsequent System)High
Integrity (Subsequent System)High
Availability (Subsequent System)High

Affected & Patched Versions

Affected Versions
  • Zenitel VSFF6 < 9.6.3.0
  • Zenitel VSFF6 >= 10.0.0.0 and < 10.1.3.0
  • Zenitel VSFF8 < 9.6.3.0
  • Zenitel VSFF8 >= 10.0.0.0 and < 10.1.3.0
  • Zenitel VSFF8MP < 9.6.3.0
  • Zenitel VSFF8MP >= 10.0.0.0 and < 10.1.3.0
  • Zenitel VSFF8MN < 9.6.3.0
  • Zenitel VSFF8MN >= 10.0.0.0 and < 10.1.3.0
  • Zenitel VSFT < 9.6.3.0
  • Zenitel VSFT >= 10.0.0.0 and < 10.1.3.0
Patched Versions
  • Zenitel VSFF6 9.6.3.0
  • Zenitel VSFF6 10.1.3.0
  • Zenitel VSFF8 9.6.3.0
  • Zenitel VSFF8 10.1.3.0
  • Zenitel VSFF8MP 9.6.3.0
  • Zenitel VSFF8MP 10.1.3.0
  • Zenitel VSFF8MN 9.6.3.0
  • Zenitel VSFF8MN 10.1.3.0
  • Zenitel VSFT 9.6.3.0
  • Zenitel VSFT 10.1.3.0

What to do

Plan remediation soon. No exploitation is confirmed yet, but the severity is critical.

  1. Check whether you run Zenitel VSFF6 and which version.
  2. Update to a patched version listed above, then confirm the new version.

Timeline

  • Nov 13, 2026Published
  • Nov 13, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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External References

Data last checked: Nov 13, 2026 16:14 GMT+0000