Executive Summary

CVE-2026-11499 is a stack-based buffer overflow vulnerability found in the Tenda HG10 router's web management interface. It specifically affects the formDOMAINBLK function via the blkDomain parameter.

The vulnerability occurs because the input from the blkDomain parameter is copied into a stack buffer without proper length validation, which can overwrite the stack frame.

An attacker can exploit this remotely without authentication by sending crafted input to the blkDomain parameter, potentially causing the web service to crash or allowing arbitrary code execution depending on the environment.

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Impact Analysis

This vulnerability can have severe impacts including denial of service and remote code execution.

• Denial of Service: An attacker can crash the Boa web service running on the router, causing network disruption.
• Remote Code Execution: Depending on the runtime environment and existing protections, an attacker might execute arbitrary code on the device, potentially gaining control over the router.
• Since the attack requires no authentication and can be performed remotely, it poses a high risk to network security and device integrity.

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Detection Guidance

This vulnerability can be detected by monitoring for unusual or malformed HTTP requests targeting the /boaform/formDOMAINBLK endpoint, specifically those manipulating the blkDomain parameter with excessively long input values that may trigger a stack-based buffer overflow.

To detect potential exploitation attempts, you can use network traffic inspection tools or web server logs to identify suspicious requests to the vulnerable interface.

Example commands to detect such attempts might include:

• Using tcpdump to capture HTTP requests to the vulnerable path: tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep '/boaform/formDOMAINBLK'
• Using grep on web server logs to find requests with long blkDomain parameters: grep '/boaform/formDOMAINBLK' /var/log/boa/access.log | grep 'blkDomain=' | awk '{ if(length($0) > 100) print $0 }'

These commands help identify attempts to exploit the vulnerability by looking for unusually long or malformed input in the blkDomain parameter.

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Mitigation Strategies

Immediate mitigation steps include restricting access to the web management interface of the affected Tenda HG7HG9 and HG10 devices to trusted networks or IP addresses only.

Disabling remote management or web interface access from untrusted networks can prevent remote exploitation.

Additionally, monitoring and filtering incoming HTTP requests to block those targeting /boaform/formDOMAINBLK with suspicious or overly long blkDomain parameters can reduce risk.

If available, applying firmware updates or patches from the vendor that address this vulnerability is strongly recommended.

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Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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