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**Name of the Vulnerable Software and Affected Versions** TOTOLINK A720R version 4.1.5cu.630 B20250509 **Description** Memory corruption can occur in the MAC Filtering component when the `setMacFilterRules` function within the 'cstecgi.cgi' endpoint is processed. A remote attacker can trigger this issue by manipulating the `desc` argument. **Recommendations** Update TOTOLINK A720R version 4.1.5cu.630 B20250509 to a newer version. Restrict administrative access to the device.