CVE-2025-60685: Totolink a720r Firmware

Medium severity, CVSS 5.1. EPSS: 0.2% chance of exploitation in the next 30 days.

A stack buffer overflow exists in the ToToLink A720R Router firmware V4.1.5cu.614_B20230630 within the sysconf binary (sub_401EE0 function). The binary reads the /proc/stat file using fgets() into a local buffer and subsequently parses the line using sscanf() into a single-byte variable with the %s format specifier. Maliciously crafted /proc/stat content can overwrite adjacent stack memory, potentially allowing an attacker with filesystem write privileges to execute arbitrary code on the device.

Affected products

• Totolink a720r Firmware: version 4.1.5cu.614_b20230630 only

Published 2025-11-13. Last modified 2026-07-05.