CVE-2025-62774 identifies a security weakness in the Mercku M6a wireless device's authentication mechanism, specifically in versions up to 2.1.0. The vulnerability stems from the use of predictable session tokens generated based on timestamps, which constitutes insufficient entropy (CWE-331). Session tokens are critical for maintaining secure authenticated sessions, and predictability in their generation can allow attackers to guess or reproduce valid tokens. The CVSS 3.1 base score of 3.1 reflects a low severity, primarily because the attack vector is adjacent network (AV:A), the attack complexity is high (AC:H), no privileges are required (PR:N), and no user interaction is needed (UI:N). The impact is limited to confidentiality (C:L), with no impact on integrity or availability. The predictable tokens could theoretically allow an attacker on the same or adjacent network segment to hijack sessions or gain unauthorized access, but the high complexity and network proximity requirements reduce the likelihood of successful exploitation. No public exploits or patches are currently available, indicating that the vulnerability is newly disclosed and not yet actively exploited. The root cause is the insufficient randomness in token generation, which should be addressed by implementing cryptographically secure random number generation for session tokens.

For European organizations, the impact of this vulnerability is relatively low but not negligible. Confidentiality could be compromised if an attacker successfully predicts session tokens, potentially allowing unauthorized access to device management interfaces or user sessions. This could lead to information disclosure or unauthorized configuration changes if combined with other vulnerabilities or misconfigurations. However, the high attack complexity and requirement for network adjacency limit the scope of affected systems primarily to local or nearby attackers rather than remote adversaries over the internet. Organizations relying on Mercku M6a devices in sensitive environments or critical infrastructure should consider the risk more seriously, as any unauthorized access could have cascading effects. The absence of integrity and availability impacts means the vulnerability is unlikely to cause direct service disruption or data tampering. Overall, the threat is moderate for organizations with significant deployment of these devices, especially in environments where network segmentation is weak.

Since no official patches are currently available, European organizations should implement compensating controls to mitigate risk. These include: 1) Restricting network access to Mercku M6a devices by enforcing strict network segmentation and firewall rules to limit adjacency to trusted hosts only. 2) Monitoring network traffic for anomalous session token usage or repeated authentication attempts that could indicate token guessing. 3) Disabling remote management interfaces if not required or restricting them to secure management VLANs. 4) Encouraging users and administrators to update to newer firmware versions once Mercku releases patches addressing this issue. 5) Employing multi-factor authentication (MFA) on device management portals if supported, to reduce the impact of token compromise. 6) Conducting regular security audits and penetration testing focused on wireless device authentication mechanisms. These steps go beyond generic advice by focusing on network-level controls and proactive monitoring tailored to the nature of the vulnerability.