CVE-2026-3732 is a critical stack-based buffer overflow vulnerability identified in the Tenda F453 router firmware version 1.0.0.3. The vulnerability arises from unsafe use of the strcpy function in the /goform/exeCommand endpoint, where the cmdinput parameter is not properly validated or bounded, allowing an attacker to overwrite the stack memory. This overflow can corrupt the execution flow, enabling remote attackers to execute arbitrary code with elevated privileges on the device. The vulnerability is remotely exploitable over the network without requiring authentication or user interaction, significantly increasing its risk profile. The CVSS v4.0 score of 8.7 reflects the high impact on confidentiality, integrity, and availability, combined with low attack complexity and no privileges or user interaction needed. The flaw could allow attackers to take full control of the affected router, potentially intercepting, modifying, or disrupting network traffic. Although no known exploits have been observed in the wild yet, the public disclosure of the vulnerability increases the likelihood of exploitation attempts. The lack of an official patch or mitigation guidance from the vendor at the time of disclosure further elevates the threat. This vulnerability affects a specific firmware version, so devices running other versions or different models are not impacted. The Tenda F453 is a consumer and small office/home office (SOHO) router, commonly deployed in various regions worldwide, making the vulnerability relevant to a broad user base.

The exploitation of CVE-2026-3732 can have severe consequences for organizations and individuals using the affected Tenda F453 routers. Successful exploitation allows attackers to execute arbitrary code remotely with elevated privileges, effectively gaining full control over the device. This can lead to interception and manipulation of all network traffic passing through the router, compromising confidentiality and integrity of sensitive data. Attackers could also disrupt network availability by causing device crashes or reboots. In enterprise or critical infrastructure environments, compromised routers can serve as footholds for lateral movement, data exfiltration, or launching further attacks against internal systems. The vulnerability's remote and unauthenticated nature makes it particularly dangerous, as attackers can exploit it without prior access or user interaction. The absence of patches or mitigations at disclosure time increases the window of exposure. Organizations relying on Tenda F453 devices should consider the risk of espionage, data theft, service disruption, and reputational damage. The impact extends beyond individual devices to the broader network security posture, especially in environments with limited network segmentation or monitoring.

To mitigate the risk posed by CVE-2026-3732, organizations should first verify if they are using the affected Tenda F453 firmware version 1.0.0.3. If so, immediate steps include isolating the vulnerable devices from untrusted networks and restricting remote management access to trusted IP addresses only. Network-level controls such as firewall rules should block inbound traffic to the /goform/exeCommand endpoint or the router's management interfaces from external sources. Monitoring network traffic for unusual activity or exploitation attempts targeting this endpoint is recommended. If possible, disable remote management features until a vendor patch or firmware update is available. Organizations should engage with Tenda support channels to obtain official patches or firmware updates addressing this vulnerability. In the absence of patches, consider replacing affected devices with models not impacted by this vulnerability. Additionally, implement network segmentation to limit the impact of a compromised router and enforce strong network access controls. Regularly audit router configurations and firmware versions to ensure timely detection of vulnerable devices. Employ intrusion detection/prevention systems (IDS/IPS) with signatures for this vulnerability once available. Finally, maintain an incident response plan to quickly address potential exploitation events.