CVE-2025-59818
Command Injection via Uploaded File Name in Authenticated Sessions
Publication date: 2026-02-04
Last updated on: 2026-02-11
Assigner: National Cyber Security Centre Netherlands (NCSC-NL)
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| zenitel | tcis-3_firmware | to 9.2.3.3 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-77 | The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
[{'type': 'paragraph', 'content': 'CVE-2025-59818 is an authenticated remote code execution (RCE) vulnerability found in multiple Zenitel device firmware versions. It allows an authenticated attacker to execute arbitrary commands on the underlying system by exploiting the file name of an uploaded file through the "zForm_upload_scripts" functionality in the device\'s web interface.'}, {'type': 'paragraph', 'content': 'The vulnerability arises from legacy web interface components that improperly handle uploaded file names, enabling attackers with valid credentials to run arbitrary code remotely.'}, {'type': 'paragraph', 'content': 'This issue has been addressed by redesigning or removing the affected legacy web interface components in firmware updates starting from version 9.3.3.0 (or 8.2.3.4 for legacy TCIV hardware). Users are strongly advised to upgrade to these versions or later to mitigate the vulnerability.'}] [1, 2, 3, 4, 5]
How can this vulnerability impact me? :
This vulnerability can have severe impacts as it allows an authenticated attacker to execute arbitrary commands on the affected system remotely.
- Complete compromise of the device's operating system.
- Potential unauthorized control over device functions and data.
- Disruption of normal device operations or service availability.
- Escalation of privileges or lateral movement within a network if the device is connected.
Given the CVSS base score of 10.0, this vulnerability is critical and poses a high risk to affected systems if exploited.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
To mitigate the CVE-2025-59818 vulnerability, users should upgrade their Zenitel device firmware to version 9.3.3.0 or later (8.2.3.4 for legacy TCIV hardware).
This vulnerability is an authenticated remote code execution (RCE) issue related to the “zForm_upload_scripts” functionality, and the fix involves redesigning or removing affected legacy web interface components to prevent misuse.
Upgrading to the specified firmware versions applies the necessary security patches and protects against this and related authenticated RCE vulnerabilities.