CVE-2026-7242
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
Can you explain this vulnerability to me?
CVE-2026-7242 is a command injection vulnerability in the TOTOLINK A8000RU router, version 7.1cu.643_b20200521. It exists in the CGI Handler component, specifically in the function setOpenVpnClientCfg within the /cgi-bin/cstecgi.cgi file.
The vulnerability arises because a user-supplied parameter named "Enabled" is improperly sanitized before being used in system commands. This parameter is passed to a function that executes operating system commands, allowing an attacker to inject arbitrary commands remotely.
A proof of concept shows that by sending a crafted HTTP POST request with the "Enabled" parameter set to a command like `ls>./setOpenVpnClientCfg.txt`, the router executes this command, demonstrating remote code execution capability.
How can this vulnerability impact me? :
This vulnerability allows remote attackers to execute arbitrary operating system commands on the affected router without any authentication.
The impact includes potential full compromise of the device, unauthorized access to network resources, disruption of network services, and the possibility of using the device as a foothold for further attacks within the network.
Because the exploit can be performed remotely and without user interaction, it poses a high risk to the security and integrity of the affected network environment.
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 HTTP POST request to the /cgi-bin/cstecgi.cgi endpoint of the TOTOLINK A8000RU router, specifically targeting the 'Enabled' parameter in the setOpenVpnClientCfg function.
A proof of concept involves setting the 'Enabled' parameter to a command such as `ls>./setOpenVpnClientCfg.txt`. If the router executes this command, it will create a text file containing the directory listing, confirming the presence of the vulnerability.
- Use a command like the following curl request to test for the vulnerability:
- curl -X POST http://[router_ip]/cgi-bin/cstecgi.cgi -d 'Enabled=ls>./setOpenVpnClientCfg.txt'
After sending the request, check the router's filesystem for the presence of the file 'setOpenVpnClientCfg.txt' to confirm command execution.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The vulnerability in Totolink A8000RU allows remote attackers to execute arbitrary operating system commands via a command injection flaw in the CGI Handler. This can lead to unauthorized access, data manipulation, or disruption of services.
Such unauthorized remote code execution vulnerabilities can impact compliance with common standards and regulations like GDPR and HIPAA, which require protection of personal and sensitive data, ensuring system integrity and preventing unauthorized access.
If exploited, this vulnerability could lead to data breaches or system compromises, potentially violating requirements for data confidentiality, integrity, and availability mandated by these regulations.
What immediate steps should I take to mitigate this vulnerability?
To mitigate the CVE-2026-7242 vulnerability in the TOTOLINK A8000RU router, immediate steps should focus on preventing exploitation of the command injection flaw in the /cgi-bin/cstecgi.cgi interface.
- Restrict or block remote access to the router's CGI interface, especially the /cgi-bin/cstecgi.cgi endpoint, to prevent attackers from sending crafted HTTP POST requests.
- Implement network-level protections such as firewall rules or access control lists to limit access to trusted IP addresses only.
- Monitor router logs for suspicious requests targeting the 'Enabled' parameter or unusual command execution attempts.
- Check for and apply any available firmware updates or patches from the vendor that address this vulnerability.
- If no patch is available, consider temporarily disabling the vulnerable functionality or replacing the affected device until a fix is released.