Executive Summary

CVE-2026-2537 is a command injection vulnerability found in Comfast CF-E4 version 2.6.0.1. It exists in the HTTP POST request handler at the endpoint /cgi-bin/mbox-config?method=SET&section=ntp_timezone. The vulnerability arises because the timestr argument is improperly handled and directly used in system commands without proper sanitization. This allows an attacker to inject and execute arbitrary commands on the device remotely, given they have the required authentication.

The flaw is classified under CWE-77 (command injection) and corresponds to the MITRE ATT&CK technique T1202. Exploitation requires an enhanced level of authentication, but a proof-of-concept exploit is publicly available, making it easier to exploit.

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Impact Analysis

This vulnerability can impact you by allowing an attacker to execute arbitrary commands on the affected device with root privileges. This compromises the confidentiality, integrity, and availability of the system.

• Remote attackers with authentication can gain full control over the device.
• Attackers can manipulate system functions, potentially disrupting services or stealing sensitive information.
• Since the exploit is publicly available, the risk of exploitation is increased.

No patches or mitigations are currently available, so affected devices should be replaced or isolated to reduce risk.

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Compliance Impact

I don't know

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Detection Guidance

Detection of this vulnerability involves monitoring for HTTP POST requests to the endpoint /cgi-bin/mbox-config with the parameters method=SET and section=ntp_timezone, especially those containing suspicious or crafted values in the timestr argument.

Since exploitation requires authentication and involves command injection via the timestr parameter, network detection can focus on identifying unusual POST requests to this endpoint or unexpected command execution behavior on the device.

Specific commands to detect exploitation attempts are not provided in the available resources. However, monitoring web server logs for POST requests to /cgi-bin/mbox-config?method=SET&section=ntp_timezone and inspecting the timestr parameter for suspicious input could help.

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Mitigation Strategies

There are no known patches or vendor-provided mitigations available for this vulnerability as the vendor did not respond to the disclosure.

Immediate mitigation steps include considering replacement of the affected product to avoid exposure.

Additionally, restricting network access to the vulnerable endpoint, enforcing strict authentication controls, and monitoring for suspicious activity may help reduce risk until a more permanent solution is implemented.

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