CVE-2021-32030: ASUS Routers Improper Authentication Vulnerability

Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2025-06-02. EPSS: 99.4% chance of exploitation in the next 30 days.

The administrator application on ASUS GT-AC2900 devices before 3.0.0.4.386.42643 and Lyra Mini before 3.0.0.4_384_46630 allows authentication bypass when processing remote input from an unauthenticated user, leading to unauthorized access to the administrator interface. This relates to handle_request in router/httpd/httpd.c and auth_check in web_hook.o. An attacker-supplied value of '\0' matches the device's default value of '\0' in some situations. Note: All versions of Lyra Mini and earlier which are unsupported (End-of-Life, EOL) are also affected by this vulnerability, Consumers can mitigate this vulnerability by disabling the remote access features from WAN.

Affected products

• ASUS Gt-AC2900 Firmware: before 3.0.0.4.386.42643 (fixed in 3.0.0.4.386.42643)
• ASUS Lyra Mini Firmware: before 3.0.0.4.384.46630 (fixed in 3.0.0.4.384.46630)

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