CVE-2026-0837 identifies a critical buffer overflow vulnerability in the UTT 进取 520W router firmware version 1.7.7-180627. The vulnerability arises from improper handling of the GroupName parameter passed to the strcpy function within the /goform/formFireWall endpoint. Since strcpy does not perform bounds checking, an attacker can supply an overly long GroupName argument to overflow the buffer, corrupting adjacent memory. This flaw can be exploited remotely over the network without requiring user interaction or prior authentication, although the attacker must have low privileges on the device. The vulnerability impacts confidentiality, integrity, and availability by potentially allowing arbitrary code execution, device takeover, or denial of service. The CVSS v4.0 score is 8.7 (high), reflecting the ease of exploitation and severe impact. Despite early vendor notification, no patches or mitigations have been provided, and a public exploit exists, increasing the risk of exploitation. The affected product is primarily deployed in networking environments requiring firewall configuration, making it a critical asset in organizational infrastructure. The lack of vendor response and patch availability necessitates immediate defensive measures to prevent exploitation.

For European organizations, exploitation of this vulnerability could lead to full compromise of affected routers, enabling attackers to intercept or manipulate network traffic, disrupt connectivity, or pivot into internal networks. This is particularly impactful for enterprises and service providers relying on UTT 进取 520W devices for perimeter security or internal segmentation. Confidential data could be exposed, integrity of network policies compromised, and availability of critical services disrupted. The public exploit availability increases the likelihood of targeted attacks or opportunistic scanning campaigns. Organizations in sectors with high security requirements such as finance, government, and critical infrastructure are at elevated risk. The absence of vendor patches prolongs exposure, and the vulnerability could be leveraged in broader attack campaigns affecting supply chains or regional networks.

Since no official patch is available, European organizations should implement network-level mitigations such as isolating affected devices behind strict firewall rules that restrict access to the /goform/formFireWall endpoint. Employ network intrusion detection/prevention systems (IDS/IPS) tuned to detect exploit signatures targeting this vulnerability. Disable remote management interfaces if not strictly necessary, or restrict them to trusted IP addresses only. Regularly audit and monitor router logs for unusual activity or repeated attempts to access the vulnerable endpoint. Consider network segmentation to limit the impact of a compromised device. Engage with UTT or authorized resellers to seek firmware updates or workarounds. As a longer-term measure, evaluate replacement of vulnerable devices with alternatives from vendors with active security support. Maintain up-to-date asset inventories to identify all affected devices promptly.