CVE-2026-4552 identifies a stack-based buffer overflow vulnerability in the Tenda F453 router firmware version 1.0.0.3. The vulnerability resides in the fromVirtualSer function, part of the Parameters Handler component, specifically in the /goform/VirtualSer endpoint. The issue arises from improper validation and handling of the 'page' argument passed to this function, which allows an attacker to overflow the stack buffer. This type of vulnerability can lead to memory corruption, enabling an attacker to execute arbitrary code remotely with elevated privileges on the device. The attack vector is network-based, requiring no authentication or user interaction, making it highly accessible to remote attackers. The vulnerability was publicly disclosed on March 22, 2026, and although no exploits have been reported in the wild yet, the public disclosure increases the likelihood of exploitation attempts. The CVSS 4.0 base score of 8.7 reflects the vulnerability's critical impact on confidentiality, integrity, and availability, with low attack complexity and no privileges or user interaction required. The affected product, Tenda F453, is a consumer-grade router commonly used in residential and small business environments, which may lack robust security controls, further increasing risk. The absence of an official patch or mitigation guidance at the time of disclosure necessitates immediate defensive measures to reduce exposure.

The exploitation of CVE-2026-4552 can have severe consequences for organizations and individuals using the Tenda F453 router. Successful exploitation allows remote attackers to execute arbitrary code with elevated privileges, potentially leading to full device compromise. This can result in unauthorized access to internal networks, interception or manipulation of network traffic, disruption of network availability, and the establishment of persistent backdoors. For organizations, this could mean exposure of sensitive data, lateral movement within corporate networks, and disruption of business operations. Given the router’s role as a network gateway, compromise can undermine the security of all connected devices. The vulnerability’s remote, unauthenticated exploitability and high impact on confidentiality, integrity, and availability make it a critical threat. The lack of known exploits in the wild currently reduces immediate risk but does not eliminate it, especially as public disclosure may prompt attackers to develop exploits rapidly. The impact is particularly pronounced in environments where Tenda F453 devices are widely deployed without additional network segmentation or monitoring.

1. Immediately restrict remote access to the router’s management interface by disabling WAN-side administration or limiting access to trusted IP addresses only. 2. Implement network segmentation to isolate the Tenda F453 devices from critical infrastructure and sensitive data assets. 3. Monitor network traffic for unusual patterns or attempts to access the /goform/VirtualSer endpoint, using intrusion detection or prevention systems. 4. Apply any available firmware updates or patches from Tenda as soon as they are released; if no patch is available, consider replacing affected devices with models from vendors with timely security support. 5. Employ strong network perimeter defenses such as firewalls to block unsolicited inbound traffic targeting router management interfaces. 6. Conduct regular security assessments and vulnerability scans on network devices to detect and remediate similar issues proactively. 7. Educate users and administrators about the risks of exposing router management interfaces to the internet and enforce strict access controls. 8. If possible, disable or limit the functionality of the vulnerable /goform/VirtualSer endpoint through configuration or custom firmware to reduce attack surface.