CVE-2026-3101 is an OS command injection vulnerability identified in Intelbras TIP 635G firmware version 1.12.3.5. The vulnerability exists in the Ping Handler component, which processes network ping requests. Due to insufficient input sanitization, an attacker can craft malicious input that is executed as an OS command on the device. This flaw allows remote attackers to execute arbitrary commands with the privileges of the vulnerable service, which operates with low privileges but without requiring authentication or user interaction. The vulnerability was publicly disclosed on February 24, 2026, with exploit code available, but the vendor has not responded or provided patches. The CVSS v4.0 base score is 5.3 (medium), reflecting the network attack vector, low attack complexity, no privileges required, and no user interaction needed. The impact includes potential unauthorized command execution leading to device compromise, data leakage, or disruption of network services. The lack of vendor response and patch availability increases the urgency for organizations to implement compensating controls. Given the device’s role in network infrastructure, exploitation could facilitate lateral movement or persistent access within affected environments.

The vulnerability allows remote attackers to execute arbitrary OS commands on Intelbras TIP 635G devices, potentially leading to full device compromise. This can result in unauthorized access to sensitive network data, disruption of network services, or use of the device as a foothold for further attacks within an organization’s infrastructure. The exploitation can affect confidentiality by exposing sensitive information, integrity by allowing unauthorized changes to device configurations or data, and availability by causing device malfunction or denial of service. Since the device is typically used in network environments, successful exploitation could enable attackers to pivot to other internal systems, increasing the overall risk. The absence of vendor patches and the availability of public exploits heighten the threat level, especially for organizations relying on this hardware for critical communications or network management.

1. Immediately isolate affected Intelbras TIP 635G devices from untrusted networks to prevent remote exploitation. 2. Implement strict network segmentation and firewall rules to restrict access to the device’s management interfaces, allowing only trusted IP addresses. 3. Monitor network traffic for unusual ping requests or command injection patterns targeting the device. 4. Disable or restrict the Ping Handler service if possible, or limit its functionality to trusted sources. 5. Employ intrusion detection and prevention systems (IDS/IPS) with signatures targeting known exploit patterns for this vulnerability. 6. Regularly audit device configurations and logs for signs of compromise or unauthorized command execution. 7. Engage with Intelbras support channels for updates or patches, and consider replacing vulnerable devices with alternatives if no vendor remediation is forthcoming. 8. Maintain up-to-date backups of device configurations to enable rapid recovery if compromise occurs.