CVE-2021-45756: ASUS Rt-AC5300 Firmware

Critical severity, CVSS 9.8. EPSS: 1.2% chance of exploitation in the next 30 days.

Asus RT-AC68U <3.0.0.4.385.20633 and RT-AC5300 <3.0.0.4.384.82072 are affected by a buffer overflow in blocking_request.cgi.

Affected products

• ASUS Rt-AC5300 Firmware: before 3.0.0.4.384.82072 (fixed in 3.0.0.4.384.82072)
• ASUS Rt-AC68U Firmware: before 3.0.0.4.385.20633 (fixed in 3.0.0.4.385.20633)

Published 2022-03-23. Last modified 2026-07-09.