CVE-2025-67561 identifies a missing authorization vulnerability in the Oleksandr Lysyi Debug Log Viewer, specifically affecting versions up to and including 2.0.3. The vulnerability arises from incorrectly configured access control security levels, allowing unauthenticated remote attackers to access debug logs without proper authorization checks. Debug Log Viewer is a tool used to view application or system debug logs, which often contain sensitive information such as error messages, system paths, configuration details, or even credentials. The absence of authorization means that any attacker with network access to the service can retrieve these logs, leading to potential information disclosure (confidentiality impact) and limited ability to alter log data (integrity impact). The CVSS vector (AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N) indicates that the attack requires adjacent network access (e.g., local network or VPN), has low attack complexity, requires no privileges or user interaction, and impacts confidentiality and integrity but not availability. No patches or exploits are currently reported, but the vulnerability is publicly disclosed and should be addressed promptly. The flaw could be exploited in environments where the Debug Log Viewer is exposed to untrusted networks or insufficiently segmented internal networks, increasing the risk of unauthorized data exposure.

For European organizations, the primary impact of CVE-2025-67561 is the unauthorized disclosure of sensitive debug information, which could facilitate further attacks such as privilege escalation, lateral movement, or targeted exploitation of other vulnerabilities. Organizations in sectors with strict data protection requirements (e.g., finance, healthcare, critical infrastructure) may face compliance risks if sensitive data is exposed. The integrity impact, while limited, could allow attackers to manipulate logs, potentially obscuring malicious activity or misleading incident response efforts. Since the vulnerability does not affect availability, operational disruption is unlikely. However, the ease of exploitation without authentication and user interaction increases the risk in environments where the Debug Log Viewer is accessible over adjacent networks. European entities using this software in development, testing, or production environments should assess exposure and potential data sensitivity. The lack of known exploits reduces immediate risk but does not eliminate the threat, especially as public disclosure may prompt attackers to develop exploits.

To mitigate CVE-2025-67561, European organizations should: 1) Immediately restrict network access to the Debug Log Viewer service, ensuring it is not exposed to untrusted or public networks; 2) Implement strict access control mechanisms, such as authentication and authorization layers, to prevent unauthorized access; 3) Use network segmentation and firewall rules to limit access to the Debug Log Viewer only to trusted administrators or systems; 4) Monitor access logs and network traffic for unusual or unauthorized access attempts to the Debug Log Viewer; 5) If possible, upgrade to a patched version once available or apply vendor-provided mitigations; 6) Conduct internal audits to identify any exposure of debug logs and assess the sensitivity of the information disclosed; 7) Educate development and operations teams about secure configuration practices for debugging tools; 8) Consider disabling or removing the Debug Log Viewer from production environments where it is not essential; 9) Employ intrusion detection/prevention systems to detect exploitation attempts targeting this vulnerability; 10) Maintain an incident response plan to address potential data breaches resulting from this vulnerability.