ASUS · Routers
CVE-2021-32030
ASUS Routers Improper Authentication Vulnerability
What it is
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.
CISA: ASUS Lyra Mini and ASUS GT-AC2900 devices contain an improper authentication vulnerability that allows an attacker to gain unauthorized access to the administrative interface. The impacted products could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization.
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Deadline for US federal agencies: June 23, 2025
- Added to the CISA list
- June 2, 2025
- Published
- May 6, 2021
- Severity
- Critical 9.8 CVSS 3.1
- Chance of attacks in the next 30 days (EPSS)
- 99.4% in the top 0.1% of all known vulnerabilities
- Weakness
- CWE-287
- More details
- NVD · CVE.org · CISA
All references (4)
- https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-Gaming-Routers/RT-AC2900/HelpDesk_BIOS/
- https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0010.md
- https://www.atredis.com/blog/2021/4/30/asus-authentication-bypass
- https://www.asus.com/us/supportonly/lyra%20mini/helpdesk_bios/
More exploited flaws from ASUS
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Dec 17, 2025 | Embedded Malicious Code | Live Update | Critical 9.3 | 1.2% |
| Jun 2, 2025 | OS Command Injection | RT-AX55 Routers | High 8.8 | 40% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.