CVE-2026-113391
Deferred Deferred - Pending Action

Command Injection in DrayTek Vigor2900 Firmware

Publication date: 2026-10-20

Last updated on: 2026-10-20

Assigner: VulDB

Description
A vulnerability has been found in DrayTek Vigor2960 1.5.1.6 Revision 8218. This affects the function uploadlangs of the file /cgi-bin/mainfunction.cgi of the component Upload Endpoint. Such manipulation leads to command injection. The attack can be executed remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 1.5.1.7 is able to mitigate this issue. It is recommended to upgrade the affected component. The vendor explains: "2960 1.5.1.7 has corrected many security issues. And 2960 is EoS with limited support, only major issues would be reviewed(e.g. unauthenticated vuln.)". This vulnerability only affects products that are no longer supported by the maintainer.

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Meta Information

Published
2026-10-20
Last Modified
2026-10-20
Generated
2026-11-09
AI Q&A
2026-10-20
EPSS Evaluated
2026-11-08
NVD
CVE-2026-113391
EUVD
EUVD-2026-104990

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
DrayTek Vigor2960 1.5.1.6 Revision 8218

Helpful Resources

Exploitability

CWE
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KEV
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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.
CWE-74 The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

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Executive Summary

This is a command injection vulnerability in DrayTek Vigor2960 firmware version 1.5.1.6. It affects the uploadlangs function in /cgi-bin/mainfunction.cgi. Attackers with authenticated access can inject malicious commands via filename parameters, leading to arbitrary code execution on the device.

Detection Guidance

To detect this vulnerability, check if your DrayTek Vigor2960 is running firmware version 1.5.1.6 (revision 8218). Verify the affected endpoints (/uploadlangs, /certificaterequestupload, /userkeyupload, /usercetificateupload, /trustcaupload) for improper filename handling. Use network scans to identify unauthenticated access attempts to these endpoints.

Impact Analysis

An attacker could gain control of your DrayTek Vigor2960 device, execute arbitrary commands, and potentially access sensitive data or network resources. This requires an authenticated session but could lead to full system compromise.

Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, violating GDPR and HIPAA requirements for data protection and access control. Non-compliance risks include fines and legal penalties.

Mitigation Strategies

Immediately upgrade the firmware to version 1.5.1.7 or later. Disable or restrict access to the vulnerable endpoints if an upgrade is not immediately possible. Ensure all administrator accounts use strong passwords and enforce multi-factor authentication.

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