CVE-2026-24103 identifies a critical buffer overflow vulnerability in the Tenda AC15V1.0 router firmware version V15.03.05.18_multi, specifically in the goform/formSetMacFilterCfg web interface endpoint. The vulnerability is classified under CWE-120, indicating a classic buffer overflow due to improper input validation or bounds checking. This flaw allows an unauthenticated remote attacker to send specially crafted requests to the vulnerable endpoint, causing memory corruption that can lead to arbitrary code execution. The CVSS v3.1 score of 9.8 reflects the vulnerability's high exploitability and severe impact, with attack vector being network-based (AV:N), no privileges required (PR:N), no user interaction (UI:N), and full impact on confidentiality, integrity, and availability (C:H/I:H/A:H). Although no public exploits are currently known, the nature of the vulnerability makes it a prime target for attackers seeking to compromise network devices. The vulnerability affects the Tenda AC15V1.0 router firmware version V15.03.05.18_multi, a consumer-grade wireless router commonly used in various regions. The lack of an available patch at the time of publication increases the urgency for mitigation through alternative means. The vulnerability's exploitation could allow attackers to gain control over the device, intercept or manipulate network traffic, disrupt network availability, or use the device as a pivot point for further attacks within the network.

The impact of CVE-2026-24103 is severe for organizations relying on the Tenda AC15V1.0 router model. Successful exploitation can lead to complete compromise of the affected device, allowing attackers to execute arbitrary code remotely without authentication or user interaction. This can result in unauthorized access to internal networks, interception of sensitive data, disruption of network services, and potential lateral movement to other systems. For enterprises and service providers, this could mean significant operational downtime, data breaches, and reputational damage. The vulnerability also poses risks to home users and small businesses that use this router model, potentially exposing their networks to botnet recruitment or espionage. Given the router’s role as a network gateway, exploitation could undermine the security of all connected devices. The absence of known exploits in the wild currently provides a window for proactive defense, but the high severity score indicates that attackers are likely to develop exploits rapidly once the vulnerability becomes widely known.

Until an official patch is released by Tenda, organizations should implement specific mitigations to reduce exposure. First, restrict access to the router’s management interface by limiting it to trusted internal IP addresses and disabling remote management features if enabled. Employ network segmentation to isolate vulnerable devices from critical infrastructure. Use firewall rules to block unsolicited inbound traffic targeting the router’s web interface ports. Monitor network traffic for unusual patterns or attempts to access the goform/formSetMacFilterCfg endpoint. Regularly audit router firmware versions and subscribe to vendor advisories for timely patch updates. Consider replacing affected devices with models from vendors with stronger security track records if patching is delayed. Additionally, implement intrusion detection/prevention systems (IDS/IPS) that can detect buffer overflow exploit attempts targeting known router vulnerabilities. Educate network administrators about the risks and signs of exploitation to enable rapid incident response.