CVE-2021-35327: Totolink a720r Firmware

Critical severity, CVSS 9.8. EPSS: 1.4% chance of exploitation in the next 30 days.

A vulnerability in TOTOLINK A720R A720R_Firmware v4.1.5cu.470_B20200911 allows attackers to start the Telnet service, then login with the default credentials via a crafted POST request.

Affected products

• Totolink a720r Firmware: version 4.1.5cu.470_b20200911 only

Published 2021-08-05. Last modified 2026-06-17.