What’s Vulnerable › Vulnerabilities
CVE-2021-32030: ASUS Routers Improper Authentication Vulnerability
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: yes — in CISA KEV since 2025-06-02
- EPSS: 99.4% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2021-05-06 · updated 2026-06-17
- Weakness: CWE-287
Description
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
How to fix
Upgrade to a fixed version: ASUS Gt-Ac2900 Firmware 3.0.0.4.386.42643; ASUS Lyra Mini Firmware 3.0.0.4.384.46630. Check the vendor advisory for mitigations.
References
- https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0010.md
- https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-Gaming-Routers/RT-AC2900/HelpDesk_BIOS/
- https://www.asus.com/us/supportonly/lyra%20mini/helpdesk_bios/
- https://www.atredis.com/blog/2021/4/30/asus-authentication-bypass
- https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0010.md
- https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-Gaming-Routers/RT-AC2900/HelpDesk_BIOS/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-32030
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