VSFF6: Relative Path Traversal
CVE-2026-95379 is a high-severity relative path traversal vulnerability in VSFF6 from Zenitel, with a CVSS 4.0 base score of 7.0 out of 10. It can be exploited remotely over the network by an attacker with administrator privileges, without any action from a user. The record lists version 10.1.3.0 as the first without the flaw, so updating VSFF6 to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.27% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update VSFF6 to 10.1.3.0 or a later version.
- Update VSFF8 to 10.1.3.0 or a later version.
- Update VSFF8MP to 10.1.3.0 or a later version.
- Read the advisory on zenitel.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Zenitel | VSFF6 | 10.0.3.0 up to, but not including, 10.1.3.0 | 10.1.3.0 |
| Zenitel | VSFF8 | 10.0.3.0 up to, but not including, 10.1.3.0 | 10.1.3.0 |
| Zenitel | VSFF8MP | 10.0.3.0 up to, but not including, 10.1.3.0 | 10.1.3.0 |
| Zenitel | VSFF8MN | 10.0.3.0 up to, but not including, 10.1.3.0 | 10.1.3.0 |
| Zenitel | VSFT | 10.0.3.0 up to, but not including, 10.1.3.0 | 10.1.3.0 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Attack requirements
- NoneThe attack does not depend on a particular deployment or configuration.
- Privileges required
- HighAdministrator-level access is required first.
- User interaction
- NoneNo action by a victim is required.
- Confidentiality (vulnerable system)
- NoneNo loss of confidentiality on the vulnerable system.
- Integrity (vulnerable system)
- HighSerious loss of integrity on the vulnerable system.
- Availability (vulnerable system)
- HighSerious loss of availability on the vulnerable system.
- Confidentiality (other systems)
- NoneNo loss of confidentiality on systems beyond the vulnerable one.
- Integrity (other systems)
- LowLimited loss of integrity on systems beyond the vulnerable one.
- Availability (other systems)
- LowLimited loss of availability on systems beyond the vulnerable one.
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:X/R:X/V:X/RE:X/U:X. Scored by CNA.
Official description
Path traversal in the certificate.deleteCertificate JSON-RPC method (POST /api/rpc) of the turbineweb web interface in Zenitel VSFF6, VSFF8, VSFF8MP, VSFF8MN, and VSFT devices with software versions from 10.0.3.0 before 10.1.3.0 allows authenticated administrators to delete arbitrary files as root via a relative path (../) in the file_name parameter. This can be used to cause denial of service or render the device inoperable by removing critical system files, and to weaken device security by removing files such as firewall rules or certificate trust stores.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Relative Path Traversal
The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as.. that can resolve to a location that is outside of that directory.
How developers prevent this class of flaw
- Use an application firewall that can detect attacks against this weakness. It can be beneficial in cases in which the code cannot be fixed (because it is controlled by a third party), as an emergency prevention measure while more comprehensive software assurance measures are applied, or to provide defense in depth.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
References
Other vulnerabilities in VSFF6
- 8.6 High severity
- 9.4 Critical severity
Recent Relative Path Traversal vulnerabilities
- 7.1 High severity
- 7.5 High severity
- 7.4 High severity
- 9.4 Critical severity
- 8.5 High severity
- 8.8 High severity
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