Qcs Ax2 A12 Firmware EUVD-2025-17405

Immediate mitigations: (1) Restrict local shell access to router_command.sh via file permissions and access controls; (2) Disable or remove the sync_time feature if not operationally required; (3) Implement input validation at the application layer that calls router_command.sh to reject shell metacharacters in the sync_time argument. Long-term remediation: (1) Contact your router/device OEM for a firmware update that patches the underlying Quantenna SDK or implements proper argument sanitization (e.g., using shell_escape(), avoiding shell interpretation via direct exec with argv array); (2) Replace router_command.sh with a reimplemented version that uses safe argument passing (e.g., direct system calls with argument arrays rather than shell string concatenation); (3) Implement a local input validation layer that strips or rejects characters like ;, |, $, backticks, and newlines before passing arguments to the script. Workaround for integrators: follow Quantenna's released best practices guide for safe script implementation, likely recommending quoted arguments, argument validation, and avoiding eval-like patterns. No official patch version number was provided; recommend checking with your OEM for updates after this CVE publication.