CVE-2025-7882: Mercusys MW301R Login excessive authentication
A vulnerability was found in Mercusys MW301R 1.0.2 Build 190726 Rel.59423n. It has been rated as problematic. This issue affects some unknown processing of the component Login. The manipulation leads to improper restriction of excessive authentication attempts. The attack can only be initiated within the local network. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Compensating control
Because the attack can only be initiated within the local network, restrict access to the Mercusys MW301R Login/authentication interface to only trusted local devices (e.g., via local network segmentation/ACLs or limiting who can reach the router’s management/login page).
- Compensating control
Implement a control to mitigate excessive authentication attempts against the Mercusys MW301R Login endpoint (e.g., rate limiting/throttling at the local network path or on any fronting reverse proxy/firewall controlling access to the router’s login page).
Event History
Frequently Asked Questions
What is the severity of CVE-2025-7882?
CVE-2025-7882 has been rated as problematic due to its impact on improper restriction of excessive authentication attempts.
How do I fix CVE-2025-7882?
To fix CVE-2025-7882, ensure that excessive authentication attempts are properly restricted via the device's security settings.
What component is affected by CVE-2025-7882?
CVE-2025-7882 affects the Login component of the Mercusys MW301R router.
Who is affected by CVE-2025-7882?
Users of the Mercusys MW301R with the specified firmware version are affected by CVE-2025-7882.
What type of attack can be executed due to CVE-2025-7882?
CVE-2025-7882 allows for brute force attacks due to improper restrictions on authentication attempts.