CVE-2025-7952 in TOTOLINK
Summary
by MITRE • 07/22/2025
A vulnerability classified as critical was found in TOTOLINK T6 4.1.5cu.748. This vulnerability affects the function ckeckKeepAlive of the file wireless.so of the component MQTT Packet Handler. The manipulation leads to command injection. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 07/24/2025
The vulnerability identified as CVE-2025-7952 represents a critical command injection flaw within the TOTOLINK T6 router firmware version 4.1.5cu.748. This security weakness resides in the wireless.so library component that handles MQTT packet processing through the ckeckKeepAlive function. The flaw enables remote attackers to execute arbitrary commands on the affected device by manipulating input parameters passed to this specific function. The vulnerability's classification as critical stems from its remote exploitability and the potential for full system compromise, as command injection vulnerabilities of this nature can provide attackers with complete control over the affected network device.
The technical implementation of this vulnerability demonstrates poor input validation and sanitization within the MQTT packet handler component of the router's firmware. The ckeckKeepAlive function fails to properly validate or escape user-supplied data, creating an environment where malicious inputs can be interpreted as executable commands rather than benign data. This weakness allows attackers to inject shell commands that are subsequently executed with the privileges of the MQTT packet handler process, which typically runs with elevated permissions within the router's operating system. The vulnerability's exposure through the MQTT protocol interface creates a particularly dangerous attack vector since MQTT is commonly used for device management and communication in IoT environments.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete network compromise and potential lateral movement within affected environments. Once an attacker gains command execution capabilities, they can modify router configurations, intercept network traffic, establish persistent backdoors, or use the device as a pivot point for attacking other systems within the network. The public disclosure of exploitation techniques further amplifies the risk, as security researchers and malicious actors can readily develop working exploits against vulnerable devices. This creates an immediate threat to any organization or individual utilizing affected TOTOLINK T6 routers, particularly in environments where these devices serve as network gateways or IoT infrastructure components.
Organizations should implement immediate mitigations including firmware updates from TOTOLINK if available, network segmentation to isolate affected devices, and disabling unnecessary MQTT services when possible. Network monitoring should be enhanced to detect unusual MQTT traffic patterns or command execution attempts. The vulnerability aligns with CWE-77 and CWE-78 categories related to command injection and improper input sanitization respectively, and follows attack patterns documented in the MITRE ATT&CK framework under T1059 for command and scripting interpreter and T1021 for remote services. Regular vulnerability assessments and firmware updates remain critical defensive measures, as this vulnerability demonstrates the ongoing need for robust input validation and secure coding practices in embedded network devices.