Stack Buffer Overflow in ToToLink A720R Router Firmware

CVE-2025-60685

What is CVE-2025-60685?

A vulnerability identified in the ToToLink A720R Router firmware V4.1.5cu.614_B20230630 allows for a stack buffer overflow within the sysconf binary. This issue arises when the binary reads the /proc/stat file using fgets() and subsequently parses the line using sscanf() into a single-byte variable. If an attacker with filesystem write privileges crafts malicious content for the /proc/stat file, it could lead to the overwriting of adjacent stack memory. This exploitation potential could enable the attacker to execute arbitrary code on the router, posing a significant security risk.

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