CVE-2026-3101 is an OS command injection vulnerability identified in the Intelbras TIP 635G device, version 1.12.3.5. The vulnerability resides in the Ping Handler component, which processes network ping requests. Improper input validation allows an attacker to inject arbitrary operating system commands remotely without requiring user interaction or elevated privileges beyond low-level access. This flaw enables attackers to execute commands on the underlying operating system, potentially leading to full device compromise, data leakage, or service disruption. The vulnerability has a CVSS 4.0 base score of 5.3, indicating medium severity, with attack vector as network (AV:N), low attack complexity (AC:L), no privileges required (PR:L), and no user interaction (UI:N). The vendor, Intelbras, was contacted but has not issued any patches or advisories. Public exploit code is available, increasing the risk of exploitation. The vulnerability affects a specific firmware version, suggesting that devices running 1.12.3.5 are vulnerable, while other versions may not be impacted or remain unconfirmed. The lack of vendor response and patch availability means organizations must rely on compensating controls to mitigate risk. The vulnerability primarily threatens device confidentiality, integrity, and availability by allowing unauthorized command execution remotely.

The impact of CVE-2026-3101 on organizations is significant due to the potential for remote OS command execution on Intelbras TIP 635G devices. Successful exploitation can lead to unauthorized control over the device, enabling attackers to manipulate device configurations, intercept or alter network traffic, disrupt services, or use the device as a foothold for further network intrusion. This can compromise the confidentiality and integrity of data passing through or stored on the device and impact availability if the device is rendered inoperative. Given that the vulnerability requires no user interaction and can be exploited remotely, it increases the attack surface for threat actors. Organizations relying on Intelbras TIP 635G for critical network functions, especially in telecommunications or enterprise environments, face risks of operational disruption and data breaches. The absence of vendor patches exacerbates the threat, as attackers can leverage publicly available exploits. This vulnerability could also be used in targeted attacks or as part of larger botnet campaigns, affecting network stability and security.

To mitigate CVE-2026-3101 effectively, organizations should first identify all Intelbras TIP 635G devices running firmware version 1.12.3.5. Since no official patch is available, immediate steps include isolating these devices from untrusted networks by implementing strict network segmentation and firewall rules to restrict access to the Ping Handler service or the device management interfaces. Disable or restrict ICMP echo requests (ping) if feasible, as the vulnerability is in the Ping Handler component. Employ intrusion detection and prevention systems (IDS/IPS) to monitor and block suspicious command injection patterns targeting these devices. Regularly audit device logs for unusual command execution or network activity. Consider deploying network-level anomaly detection to identify exploitation attempts. Engage with Intelbras support channels for updates or potential workarounds. For long-term security, plan to replace or upgrade affected devices to versions confirmed free of this vulnerability or alternative products with better security support. Maintain an up-to-date asset inventory and vulnerability management program to track and respond to such threats promptly.