CVE-2025-59818Network attack vector

Authenticated command execution via upload filename injection

Published Feb 4, 2026 · Updated Feb 4, 2026

Command injection in Zenitel TCIS-3+ firmware before 9.2.3.3 allows remote authenticated users to execute arbitrary system commands. The legacy zForm_upload_scripts web handler fails to neutralize shell metacharacters in an uploaded file name before invoking a system command. Exploitation requires administrative access to the device web interface and grants control of the underlying appliance.

CVSS severity10.0
Critical
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in Zenitel TCIS-3+ firmware before 9.2.3.3 allows remote authenticated users to execute arbitrary system commands. The legacy zForm_upload_scripts web handler fails to neutralize shell metacharacters in an uploaded file name before invoking a system command. Exploitation requires administrative access to the device web interface and grants control of the underlying appliance.

The record

CVE
CVE-2025-59818
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
Zenitel
Product
TCIS-3+
Classifications
CWE-77, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<9.2.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Zenitel · TCIS-3+version=<9.2.3.3

Published CVSS scores

10.0National Cyber Security Centre NetherlandsCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
9.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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