CVE-2026-4487 identifies a buffer overflow vulnerability in the UTT HiPER 1200GW device firmware up to version 2.5.3-170306. The vulnerability arises from unsafe use of the strcpy function in the /goform/websHostFilter web endpoint, which does not properly validate input length, allowing an attacker to overflow the buffer. This flaw can be exploited remotely without requiring authentication or user interaction, making it highly accessible to attackers. The buffer overflow can lead to arbitrary code execution, enabling attackers to take full control of the device, disrupt its operation, or manipulate network traffic. The CVSS 4.0 score of 8.7 reflects the high impact on confidentiality, integrity, and availability, combined with the low attack complexity and no need for privileges or user interaction. Although no active exploits have been reported in the wild, the public disclosure of the vulnerability increases the likelihood of exploitation attempts. The affected product, UTT HiPER 1200GW, is a network gateway device used in various organizational environments, potentially exposing critical network infrastructure to compromise. The lack of available patches at the time of disclosure necessitates immediate mitigation efforts to reduce risk. The vulnerability highlights the dangers of unsafe string handling in embedded device firmware and the importance of secure coding practices.

The impact of CVE-2026-4487 is significant for organizations using UTT HiPER 1200GW devices, as exploitation could lead to full device compromise. This includes unauthorized access to sensitive network traffic, disruption of network services, and potential lateral movement within the network. Confidentiality is at risk due to possible interception or manipulation of data passing through the compromised gateway. Integrity can be undermined by attackers altering device configurations or injecting malicious payloads. Availability may be affected if the device is crashed or rendered inoperable through the buffer overflow. Given the device’s role as a network gateway, such disruptions could cascade, affecting broader organizational operations and critical infrastructure. The remote, unauthenticated nature of the exploit increases the threat level, as attackers can target devices exposed to the internet or accessible from less secure network segments. This vulnerability could be leveraged in targeted attacks against organizations or in widespread automated scanning and exploitation campaigns once exploit code becomes widely available.

To mitigate CVE-2026-4487, organizations should immediately restrict external access to the UTT HiPER 1200GW management interfaces, especially the /goform/websHostFilter endpoint, using firewalls or access control lists. Network segmentation should be employed to isolate these devices from untrusted networks and limit exposure. Monitoring network traffic for unusual requests targeting the vulnerable endpoint can help detect exploitation attempts early. If possible, disable or limit the functionality of the affected web interface until a vendor patch is available. Organizations should engage with UTT for firmware updates or security advisories and apply patches promptly once released. Employing intrusion detection/prevention systems (IDS/IPS) with signatures targeting this vulnerability can provide additional defense. Regularly auditing device configurations and logs can help identify signs of compromise. As a longer-term measure, organizations should evaluate the security posture of embedded devices and consider replacing outdated or unsupported hardware with more secure alternatives.