CVE-2023-39780: ASUS RT-AX55 Routers OS Command Injection Vulnerability

High severity, CVSS 8.8. Actively exploited: in CISA KEV since 2025-06-02. EPSS: 39.5% chance of exploitation in the next 30 days.

On ASUS RT-AX55 3.0.0.4.386.51598 devices, authenticated attackers can perform OS command injection via the /start_apply.htm qos_bw_rulelist parameter. NOTE: for the similar "token-generated module" issue, see CVE-2023-41345; for the similar "token-refresh module" issue, see CVE-2023-41346; for the similar "check token module" issue, see CVE-2023-41347; and for the similar "code-authentication module" issue, see CVE-2023-41348.

Affected products

• ASUS RT-AX55 Firmware: version 3.0.0.4.386.51598 only

Published 2023-09-11. Last modified 2026-06-17.