CVE-2026-1623
Unknown Unknown - Not Provided
Remote Command Injection in Totolink A7000R Firmware Upgrade Function

Publication date: 2026-01-29

Last updated on: 2026-04-29

Assigner: VulDB

Description
A weakness has been identified in Totolink A7000R 4.1cu.4154. Impacted is the function setUpgradeFW of the file /cgi-bin/cstecgi.cgi. This manipulation of the argument FileName causes command injection. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks.
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Meta Information
Published
2026-01-29
Last Modified
2026-04-29
Generated
2026-06-19
AI Q&A
2026-01-29
EPSS Evaluated
2026-06-18
NVD
CVE-2026-1623
EUVD
EUVD-2026-4962
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
totolink a7000r_firmware 4.1cu.4154
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
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.
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.
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Executive Summary

This vulnerability is a command injection flaw in the Totolink A7000R router (version 4.1cu.4154). It exists in the setUpgradeFW function of the /cgi-bin/cstecgi.cgi file, where improper handling of the FileName argument allows an attacker to inject and execute arbitrary commands remotely without authentication. This means an attacker can manipulate the router by sending specially crafted requests to execute commands on the device. [2, 3]

Impact Analysis

The vulnerability can impact you by compromising the confidentiality, integrity, and availability of the affected device. An attacker can remotely execute arbitrary commands on the router without authorization, potentially taking full control of the device, disrupting network services, stealing sensitive information, or using the device as a foothold for further attacks. [2]

Detection Guidance

This vulnerability can be detected by monitoring for suspicious HTTP POST requests to the endpoint /cgi-bin/cstecgi.cgi, specifically targeting the setting/setUpgradeFW function with manipulated FileName parameters. Detection can involve capturing and analyzing network traffic for such requests. While no specific detection commands are provided, using tools like curl or wget to simulate or inspect POST requests to this endpoint may help identify vulnerable devices. Additionally, network intrusion detection systems (NIDS) can be configured to alert on unusual POST requests to /cgi-bin/cstecgi.cgi with suspicious payloads. [3, 2]

Mitigation Strategies

Immediate mitigation steps include replacing the affected Totolink A7000R device running firmware version 4.1cu.4154, as no known countermeasures or patches currently exist. Restricting network access to the device's management interface and monitoring for exploit attempts can reduce risk. It is also recommended to follow vendor updates and advisories for any future patches or fixes. [2]

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