CVE-2026-2135 is a command injection vulnerability identified in UTT HiPER 810 firmware version 1.7.4-141218. The flaw resides in the function sub_43F020 within the /goform/formPdbUpConfig endpoint, specifically in the handling of the policyNames parameter. An attacker can remotely send crafted requests that manipulate this parameter to inject and execute arbitrary system commands on the device. The vulnerability does not require authentication or user interaction, increasing its risk profile. The CVSS 4.0 score is 5.3 (medium), reflecting network attack vector, low complexity, no privileges required, and no user interaction, but limited impact on confidentiality, integrity, and availability. The exploit is publicly available, though no active exploitation has been reported yet. This vulnerability could allow attackers to gain control over affected devices, potentially leading to unauthorized configuration changes, data leakage, or disruption of device functionality. The absence of official patches or vendor advisories at this time necessitates immediate mitigation efforts by users. Given the device’s role in network infrastructure, exploitation could have cascading effects on network security and operations.

For European organizations, exploitation of CVE-2026-2135 could result in unauthorized remote command execution on UTT HiPER 810 devices, potentially compromising network infrastructure components. This could lead to partial loss of confidentiality through data exposure, integrity breaches via unauthorized configuration changes, and availability impacts if devices are disrupted or taken offline. Critical infrastructure sectors such as telecommunications, utilities, and government agencies using these devices may face operational disruptions or targeted attacks. The remote and unauthenticated nature of the vulnerability increases the likelihood of exploitation attempts, especially in environments where management interfaces are exposed or insufficiently segmented. The public availability of an exploit further elevates risk, necessitating proactive defense measures. While no widespread exploitation is reported, the potential for targeted attacks against high-value European networks is significant, particularly in countries with known deployments of UTT equipment or strategic infrastructure dependencies.

1. Immediately restrict network access to the management interface of UTT HiPER 810 devices by implementing firewall rules or network segmentation to limit exposure to trusted administrative networks only. 2. Employ strict input validation and sanitization on the policyNames parameter if custom firmware modifications or intermediary proxies are feasible. 3. Monitor device logs and network traffic for unusual or unauthorized requests targeting /goform/formPdbUpConfig or containing suspicious payloads indicative of command injection attempts. 4. Disable or restrict remote management features if not essential, or enforce strong authentication and access controls where possible. 5. Engage with UTT vendor support channels to obtain patches or firmware updates addressing this vulnerability as they become available. 6. Conduct regular vulnerability assessments and penetration tests focusing on network infrastructure devices to detect similar weaknesses. 7. Implement network intrusion detection/prevention systems (IDS/IPS) with signatures or heuristics to detect exploitation attempts of this CVE. 8. Maintain an incident response plan tailored to network device compromises to rapidly contain and remediate any breaches.