CVE-2025-62771 in M6a
Summary
by MITRE • 10/22/2025
Mercku M6a devices through 2.1.0 allow password changes via intranet CSRF attacks.
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Analysis
by VulDB Data Team • 10/22/2025
The vulnerability identified as CVE-2025-62771 affects Mercku M6a devices running firmware versions through 2.1.0, representing a critical security flaw that enables unauthorized password modifications through cross-site request forgery attacks. This vulnerability specifically targets the device management interface and exploits a fundamental weakness in the authentication and session management mechanisms. The flaw allows an attacker within the same intranet network to craft malicious requests that can modify device passwords without proper authorization, effectively compromising the device's administrative access control.
The technical implementation of this vulnerability stems from the absence of proper anti-CSRF token validation within the device's web-based administration interface. When administrators perform password change operations, the system fails to validate the authenticity of the request source, relying solely on the presence of valid session cookies. This design flaw creates an exploitable condition where an attacker can leverage social engineering or network-based attacks to trick authenticated users into executing malicious password change requests. The vulnerability operates at the application layer and specifically affects the device's web management interface, making it accessible through standard HTTP/HTTPS protocols. The flaw aligns with CWE-352, which defines Cross-Site Request Forgery as a security weakness where a malicious website can cause a user to perform actions without their knowledge or consent.
The operational impact of this vulnerability extends beyond simple password compromise, as it fundamentally undermines the device's security posture and can lead to complete administrative control. An attacker who successfully exploits this vulnerability can gain persistent access to the device, potentially enabling further reconnaissance and lateral movement within the network. The compromised device may serve as a pivot point for attacking other systems or establishing persistent backdoors. Additionally, the vulnerability affects the device's integrity and availability, as unauthorized modifications can disrupt normal operations or enable malicious actors to disable security features. This weakness particularly impacts industrial control systems and network infrastructure devices where maintaining administrative access is critical for operational continuity.
Mitigation strategies for this vulnerability should encompass both immediate and long-term security measures to protect affected Mercku M6a devices. Organizations should implement network segmentation and access controls to limit the attack surface, ensuring that administrative interfaces are not directly accessible from untrusted networks. The most effective immediate solution involves applying firmware updates from Mercku that include proper CSRF token validation mechanisms and enhanced session management protocols. Security professionals should also consider implementing network monitoring solutions that can detect anomalous password change activities and establish baseline behaviors for device administration. According to ATT&CK framework, this vulnerability maps to T1566.002 for social engineering and T1078 for valid accounts, highlighting the need for comprehensive defensive measures including user education and privileged access management. Organizations should also implement multi-factor authentication mechanisms and regularly audit administrative access logs to detect potential exploitation attempts and maintain compliance with security standards such as NIST SP 800-53 and ISO 27001 requirements for access control and change management.