CVE-2026-2910 is a stack-based buffer overflow vulnerability identified in the Tenda HG9 router firmware version 300001138. The vulnerability resides in the code handling the /boaform/formPing6 endpoint, specifically in the processing of the pingAddr parameter. When this argument is manipulated with a specially crafted input, it causes a stack-based buffer overflow, which can overwrite critical memory regions on the device. This flaw can be exploited remotely without requiring authentication or user interaction, making it highly accessible to attackers. The buffer overflow can enable arbitrary code execution, allowing attackers to execute malicious payloads with the privileges of the affected process, potentially leading to full device compromise. The vulnerability has a CVSS 4.0 base score of 8.7, reflecting its high severity due to the ease of exploitation and the significant impact on confidentiality, integrity, and availability. Although no known exploits are currently active in the wild, the publication of exploit code increases the likelihood of exploitation attempts. The Tenda HG9 is a network device widely used in residential and small business environments, making this vulnerability a significant risk for a broad user base. The lack of available patches or official mitigation guidance at the time of disclosure further elevates the threat. Attackers exploiting this vulnerability could disrupt network operations, intercept or manipulate network traffic, or use compromised devices as footholds for further attacks within internal networks.

The impact of CVE-2026-2910 on organizations worldwide can be substantial. Successful exploitation allows attackers to execute arbitrary code on affected Tenda HG9 routers, potentially leading to full device compromise. This can result in unauthorized access to internal networks, interception or manipulation of sensitive data, disruption of network services, and use of compromised devices as launch points for lateral movement or further attacks. For home users and small businesses relying on these routers for internet connectivity and network security, exploitation could lead to privacy breaches and service outages. Enterprises using these devices in branch offices or remote locations may face increased risk of network infiltration. The vulnerability's remote, unauthenticated exploitability and high severity score suggest a high likelihood of exploitation attempts, especially after exploit code publication. The absence of patches or mitigations increases exposure duration, amplifying potential damage. Overall, this vulnerability threatens the confidentiality, integrity, and availability of network communications and connected systems, posing a critical risk to affected organizations.

To mitigate CVE-2026-2910, organizations should first check for any official firmware updates or patches released by Tenda and apply them immediately once available. In the absence of patches, network administrators should restrict access to the router's management interfaces by implementing strict firewall rules that block inbound traffic to the /boaform/formPing6 endpoint from untrusted networks, especially the internet. Disabling remote management features or restricting them to trusted IP addresses can reduce exposure. Network segmentation should be employed to isolate vulnerable devices from critical infrastructure and sensitive data. Monitoring network traffic for unusual or malformed requests targeting the pingAddr parameter can help detect exploitation attempts early. Employing intrusion detection or prevention systems with signatures for this vulnerability can provide additional defense. Users should consider replacing affected devices with models that have a strong security track record if patches are not forthcoming. Regularly auditing device configurations and maintaining an inventory of vulnerable hardware will aid in managing risk. Finally, educating users about the risks of unpatched network devices and encouraging timely updates is essential.