CVE-2026-4487 is a buffer overflow vulnerability identified in the UTT HiPER 1200GW device firmware versions up to 2.5.3-170306. The vulnerability arises from improper handling of input in the strcpy function within the /goform/websHostFilter endpoint, which does not perform bounds checking on input data. This flaw allows an attacker to send a specially crafted request remotely to overflow the buffer, potentially overwriting adjacent memory. The consequence of this overflow can include arbitrary code execution, enabling the attacker to take control of the device, or cause a denial of service by crashing the system. The vulnerability requires no user interaction and no authentication, making it highly accessible for remote exploitation. 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 required. While no exploits have been observed in the wild yet, the public disclosure of the exploit code increases the likelihood of exploitation attempts. The affected product, UTT HiPER 1200GW, is a network gateway device used in various organizational environments, making this vulnerability critical for network security. The lack of an official patch link suggests that users must seek vendor updates or implement interim mitigations. Due to the nature of the vulnerability, attackers could leverage it to gain persistent access or disrupt network operations.

The impact of CVE-2026-4487 is significant for organizations relying on UTT HiPER 1200GW devices as network gateways or security appliances. Successful exploitation can lead to full compromise of the device, allowing attackers to execute arbitrary code, manipulate network traffic, or disrupt services. This undermines the confidentiality of sensitive data passing through the device, the integrity of network communications, and the availability of critical network infrastructure. Organizations may face operational downtime, data breaches, or lateral movement by attackers within their networks. Given the device’s role in network perimeter defense or routing, exploitation could facilitate further attacks on internal systems. The remote, unauthenticated nature of the vulnerability increases the attack surface and risk, especially for devices exposed to untrusted networks or the internet. The absence of widespread exploit activity currently provides a limited window for mitigation before potential exploitation escalates. Failure to address this vulnerability promptly could result in severe security incidents and regulatory compliance issues for affected organizations.

1. Immediately restrict external access to the /goform/websHostFilter endpoint by implementing firewall rules or access control lists to limit exposure to trusted networks only. 2. Segment the network to isolate the UTT HiPER 1200GW device from untrusted or public networks, reducing the attack surface. 3. Monitor network traffic and device logs for unusual or malformed requests targeting the vulnerable endpoint, enabling early detection of exploitation attempts. 4. Contact UTT vendor support to obtain official patches or firmware updates addressing this vulnerability; prioritize applying these updates as soon as they become available. 5. If patches are unavailable, consider temporary mitigations such as disabling the vulnerable web interface or services if feasible without disrupting operations. 6. Employ intrusion prevention systems (IPS) with signatures or heuristics capable of detecting exploitation attempts against this vulnerability. 7. Conduct regular security assessments and penetration testing to verify the effectiveness of mitigations and detect potential exploitation. 8. Educate network administrators about the vulnerability and ensure incident response plans include procedures for handling exploitation scenarios involving this device.