CVE-2026-82539: Critical Remote Memory Corruption Vulnerability in TOTOLINK A720R
A critical vulnerability (CVE-2026-82539) with a CVSS score of 9.1 was discovered in TOTOLINK A720R 4.1.5cu.630_B20250509, affecting the MAC Filtering component. The vulnerability allows remote attackers to execute memory corruption via manipulation of the 'desc' argument in the setMacFilterRules function of cstecgi.cgi. The attack can be launched remotely, and the exploit has been publicly disclosed. Immediate patching or mitigation is recommended to prevent potential exploitation.