CVE-2026-1138 is a buffer overflow vulnerability identified in the UTT 进取 520W device firmware version 1.7.7-180627. The vulnerability stems from improper handling of input in the strcpy function within the /goform/ConfigExceptQQ endpoint, which does not perform bounds checking on input data. This flaw allows a remote attacker to send specially crafted requests to the device, causing a buffer overflow that can overwrite memory and potentially execute arbitrary code. The attack vector requires no authentication or user interaction, making it highly accessible to remote attackers. The vulnerability has a CVSS 4.0 base score of 8.7, reflecting its high impact on confidentiality, integrity, and availability, with low attack complexity and no privileges required. Although no active exploitation has been observed, a public exploit exists, increasing the risk of imminent attacks. The vendor has not issued any patches or advisories, leaving users without official remediation options. The lack of vendor response and patch availability increases the urgency for organizations to implement alternative mitigations. The vulnerability affects a specific firmware version, so organizations should verify their device versions and consider isolation or replacement if patching is not possible. Given the nature of the flaw, successful exploitation could lead to full device compromise, enabling attackers to disrupt network operations, exfiltrate sensitive data, or use the device as a foothold for further attacks.

For European organizations, this vulnerability presents a critical risk, especially for those deploying UTT 进取 520W devices in network infrastructure or operational technology environments. Exploitation could lead to unauthorized control over affected devices, resulting in data breaches, service disruptions, or lateral movement within corporate networks. The ability to remotely exploit the flaw without authentication increases the threat level, particularly for devices exposed to the internet or untrusted networks. Critical sectors such as telecommunications, manufacturing, and public utilities that may use these devices could face operational downtime or compromise of sensitive information. The absence of vendor patches means organizations must rely on compensating controls, increasing operational complexity and potential costs. Additionally, the public availability of exploits raises the likelihood of opportunistic attacks targeting European entities. The impact extends beyond individual organizations to potentially affect national infrastructure resilience where these devices are deployed.

Given the lack of official patches, European organizations should immediately audit their networks to identify any UTT 进取 520W devices running the vulnerable firmware version 1.7.7-180627. Network segmentation should be enforced to isolate these devices from critical systems and limit exposure to untrusted networks, especially the internet. Implement strict access controls and firewall rules to restrict inbound traffic to the /goform/ConfigExceptQQ endpoint or the device management interfaces. Employ intrusion detection and prevention systems (IDS/IPS) with signatures or heuristics capable of detecting exploitation attempts targeting this vulnerability. Where feasible, replace vulnerable devices with updated or alternative hardware from vendors with active security support. Monitor threat intelligence feeds for any emerging exploits or vendor updates. Additionally, conduct regular security assessments and penetration tests focusing on these devices to identify potential compromise. Organizations should also prepare incident response plans specific to this vulnerability to rapidly contain and remediate any exploitation attempts.