CVE-2026-1329 is a stack-based buffer overflow vulnerability identified in the Tenda AX1803 router firmware version 1.0.0.1. The vulnerability resides in the fromGetWifiGuestBasic function, which processes parameters related to guest Wi-Fi settings via the /goform/WifiGuestSet endpoint. Specifically, the parameters guestWrlPwd, guestEn, guestSsid, hideSsid, and guestSecurity can be manipulated to overflow a stack buffer, leading to memory corruption. This flaw can be triggered remotely over the network without requiring authentication or user interaction, making it highly exploitable. The buffer overflow can allow an attacker to execute arbitrary code with elevated privileges on the device, potentially leading to full device compromise. The CVSS v4.0 score is 8.7 (high severity), reflecting the ease of exploitation (network vector, low complexity), no privileges or user interaction needed, and high impact on confidentiality, integrity, and availability. Although no confirmed active exploitation has been reported, a public exploit is available, increasing the urgency for remediation. The vulnerability affects only firmware version 1.0.0.1 of the Tenda AX1803 router, a device commonly used in home and small office environments. The lack of vendor patches at the time of reporting necessitates interim mitigations to reduce exposure.

The impact of CVE-2026-1329 is significant for organizations and individuals using the Tenda AX1803 router with the vulnerable firmware. Successful exploitation can lead to arbitrary code execution on the device, enabling attackers to gain control over the router. This can result in unauthorized network access, interception or manipulation of network traffic, disruption of network services, and pivoting to other internal systems. For enterprises relying on these routers in branch offices or remote sites, this could compromise sensitive data and network integrity. The vulnerability's remote, unauthenticated exploitability increases the risk of widespread attacks, especially if automated exploit tools are developed. Additionally, compromised routers can be enlisted in botnets or used as launch points for further attacks. The absence of patches at the time of disclosure means organizations must rely on network-level defenses and configuration changes to mitigate risk, potentially leaving critical infrastructure exposed.

1. Apply firmware updates from Tenda immediately once a patch addressing CVE-2026-1329 is released. Regularly check vendor advisories for updates. 2. Until patches are available, disable remote management interfaces on the Tenda AX1803 router to prevent external exploitation. 3. Restrict access to the router's management interface to trusted internal IP addresses only. 4. Implement network segmentation to isolate vulnerable devices from critical network assets. 5. Monitor network traffic for unusual activity targeting the /goform/WifiGuestSet endpoint or suspicious parameter patterns indicative of exploit attempts. 6. Employ intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics capable of detecting buffer overflow attempts against Tenda routers. 7. Consider replacing vulnerable devices with models from vendors with stronger security track records if patching is delayed. 8. Educate network administrators about the risks of exposing management interfaces and the importance of timely patching.