ASUS GT-AC2900 - Authentication Bypass (CVE-2021-32030)
83Exploiting IPs reported
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.
CrowdSec analysis
CVE-2021-32030 is a critical vulnerability impacting certain ASUS router models, where improper authentication validation in the administrator application can enable unauthorized access to the device’s management interface.
CrowdSec has been tracking this vulnerability and its exploits since 10th of March 2025.
Data from the CrowdSec community indicates that exploitation of CVE-2021-32030 is highly selective and intelligence-driven. Threat actors use advanced reconnaissance and carefully choose their targets, often as part of sophisticated campaigns or advanced persistent threat operations. CrowdSec network telemetry also shows that exploitation of CVE-2021-32030 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.
Exploitation attempts have been detected targeting URLs containing /appget.cgi?hook=get_cfg_clientlist().
Exploitation
Get real-time information about exploitation attempts and actors involved.
Protection
Find out relevant information to protect your stack against this CVE.
Blocklist
With our advanced worldwide network detection, CrowdSec can provide a list of IPs known for exploiting the vulnerability.
To increase your protection against this CVE, block exploitation attempts with this list of identified actors.