CVE-2026-7244
Remote OS Command Injection in Totolink A8000RU CGI Handler
Publication date: 2026-04-28
Last updated on: 2026-04-28
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| totolink | a8000ru | 7.1cu.643_b20200521 |
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. |
| CWE-78 | The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. |
Attack-Flow Graph
AI Powered Q&A
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The CVE-2026-7244 vulnerability allows remote attackers to execute arbitrary operating system commands on the TOTOLINK A8000RU router due to a command injection flaw. This can lead to unauthorized access, data manipulation, or disruption of services.
Such unauthorized access and potential data breaches can negatively impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive data, ensuring confidentiality, integrity, and availability.
Exploitation of this vulnerability could result in exposure or alteration of sensitive information, violating data protection requirements and potentially leading to legal and regulatory consequences.
Can you explain this vulnerability to me?
CVE-2026-7244 is a command injection vulnerability found in the TOTOLINK A8000RU router, version 7.1cu.643_b20200521. It exists in the CGI Handler component, specifically in the function setWiFiEasyGuestCfg within the /cgi-bin/cstecgi.cgi script.
The vulnerability arises because a user-supplied parameter named "merge" is not properly sanitized before being passed to a system command execution function. This allows an attacker to remotely execute arbitrary operating system commands on the router by crafting a malicious request that injects commands into the "merge" parameter.
A proof of concept involves sending a POST request with a specially crafted "merge" parameter that causes the router to execute commands such as listing directory contents and writing them to a file, demonstrating remote code execution capability.
How can this vulnerability impact me? :
This vulnerability can have severe impacts because it allows remote attackers to execute arbitrary operating system commands on the affected router without any authentication.
- Attackers can take full control of the router, potentially altering its configuration or behavior.
- They may use the router as a foothold to launch further attacks within the network.
- Sensitive information could be accessed or manipulated.
- The router could be used to disrupt network services or to create persistent backdoors.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability can be detected by sending a crafted POST request to the vulnerable router's CGI endpoint and observing if arbitrary commands are executed.
For example, a test command can be sent to the /cgi-bin/cstecgi.cgi endpoint with the parameter "merge" containing a command injection payload such as `ls>./setWiFiEasyGuestCfg.txt`.
If the router executes the command, it will create a file named setWiFiEasyGuestCfg.txt containing the directory listing, confirming the presence of the vulnerability.
A sample curl command to test this would be:
- curl -X POST http://[router_ip]/cgi-bin/cstecgi.cgi -d "merge=ls>./setWiFiEasyGuestCfg.txt"
After running this command, check the router's filesystem for the presence of the file setWiFiEasyGuestCfg.txt to confirm exploitation.
What immediate steps should I take to mitigate this vulnerability?
To mitigate the CVE-2026-7244 vulnerability in the TOTOLINK A8000RU router, immediate steps include restricting remote access to the affected CGI interface to prevent exploitation.
Disabling or blocking access to the /cgi-bin/cstecgi.cgi endpoint, especially the setWiFiEasyGuestCfg function, can reduce the attack surface.
Applying any available firmware updates or patches from the vendor that address this command injection flaw is critical once released.
As a temporary measure, monitoring network traffic for suspicious POST requests containing the 'merge' parameter may help detect exploitation attempts.