Full Report
ASUS has disclosed a critical security flaw impacting routers with AiCloud enabled that could permit remote attackers to perform unauthorized execution of functions on susceptible devices. The vulnerability, tracked as CVE-2025-2492, has a CVSS score of 9.2 out of a maximum of 10.0. "An improper authentication control vulnerability exists in certain ASUS router firmware series,"
Analysis Summary
# Vulnerability: Critical Authentication Flaw in ASUS AiCloud Routers
## CVE Details
- CVE ID: CVE-2025-2492
- CVSS Score: 9.2 (Critical)
- CWE: Improper Authentication Control (Inferred from description)
## Affected Systems
- Products: Certain ASUS Router firmware series utilizing AiCloud.
- Versions: Firmware branches 3.0.0.4\_382, 3.0.0.4\_386, 3.0.0.4\_388, and 3.0.0.6\_102.
- Configurations: Vulnerability exists when AiCloud is enabled.
## Vulnerability Description
A critical improper authentication control vulnerability exists in the firmware of affected ASUS routers when AiCloud functionality is enabled. This flaw can be triggered by sending a specially crafted network request, which could allow an unauthenticated, remote attacker to execute arbitrary functions on the vulnerable device.
## Exploitation
- Status: Not explicitly stated as exploited in the wild, but the criticality (CVSS 9.2) suggests high exploitation potential. No specific PoC availability mentioned.
- Complexity: Low (Implied by "crafted request" leading to unauthorized function execution).
- Attack Vector: Likely Network (Remote, as it involves a remote attacker triggering the flaw via a request).
## Impact
- Confidentiality: High (Potential unauthorized access/function execution could lead to data exposure).
- Integrity: High (Unauthorized function execution can modify system state or data).
- Availability: Medium to High (Attack could potentially disrupt router services).
## Remediation
### Patches
- Update router firmware to the latest version available for the following base branches:
- 3.0.0.4\_382
- 3.0.0.4\_386
- 3.0.0.4\_388
- 3.0.0.6\_102
### Workarounds
For immediate protection or on End-of-Life (EoL) devices:
1. **Disable AiCloud:** Ensure the AiCloud feature is turned off.
2. **Disable External Services:** Ensure services accessible from the internet (WAN) are disabled, including:
- Remote Access from WAN
- Port Forwarding
- DDNS
- VPN Server
- DMZ
- Port Triggering
- FTP
3. **Strengthen Passwords:** Implement strong, unique passwords (10+ characters, mixed case/numbers/symbols) for both the Wi-Fi network and the router administration page. Do not reuse credentials.
## Detection
- Detection focuses on monitoring abnormal network traffic targeting the router's management interface or AiCloud service endpoints immediately prior to any observed service compromise or unexpected behavior.
- Given the nature of the flaw (improper authentication control leading to function execution), detailed network packet inspection (IDS/IPS) might reveal the "crafted request" signatures once further analysis is public.
## References
- Vendor Advisory: hxxps://www.asus.com/content/asus-product-security-advisory/
- ASUS AiCloud Information: hxxps://www.asus.com/us/content/aicloud/