CVE-2021-32030
ASUS Routers Improper Authentication Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 23 June 2025). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 99.39% probability · 100th percentile
- CISA KEV
- Listed 2 June 2025 · due 23 June 2025
- Weakness
- CWE-287
- Affected
- asus/lyra mini firmware · asus/gt-ac2900 firmware
- Source
- cve@mitre.org
CISA notes
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://www.asus.com/us/supportonly/lyra%20mini/helpdesk_bios/ ; https://www.asus.com/us/supportonly/rog%20rapture%20gt-ac2900/helpdesk_bios/; https://nvd.nist.gov/vuln/detail/CVE-2021-32030
References
- https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0010.mdBroken Link, Exploit, Third Party Advisory
- https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-Gaming-Routers/RT-AC2900/HelpDesk_BIOS/Product
- https://www.asus.com/us/supportonly/lyra%20mini/helpdesk_bios/Product
- https://www.atredis.com/blog/2021/4/30/asus-authentication-bypassExploit
- https://github.com/atredispartners/advisories/blob/master/ATREDIS-2020-0010.mdBroken Link, Exploit, Third Party Advisory
- https://www.asus.com/Networking-IoT-Servers/WiFi-Routers/ASUS-Gaming-Routers/RT-AC2900/HelpDesk_BIOS/Product
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-32030US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.