CVE-2025-54152 is a vulnerability classified under CWE-823, which involves the use of an out-of-range pointer offset in QNAP Systems Inc.'s Qsync Central software, specifically affecting version 5.0.x.x. This flaw allows a remote attacker who has already obtained a valid user account to exploit the vulnerability to read sensitive portions of memory that should not be accessible. The vulnerability arises from improper bounds checking on pointer offsets, leading to potential memory disclosure. Exploitation does not require user interaction but does require authenticated access, which limits the attack surface to users with legitimate credentials. The vulnerability does not affect confidentiality, integrity, or availability in a broad sense but can lead to limited information disclosure. The vendor has addressed this issue in Qsync Central version 5.0.0.4 released on January 20, 2026. No known exploits have been reported in the wild, suggesting limited active exploitation. The CVSS v4.0 base score is 1.3, reflecting the low severity due to limited impact and required privileges. The vulnerability is relevant for organizations using Qsync Central for file synchronization and sharing, especially in environments where sensitive data is handled. Proper patching and account security are critical to mitigating this risk.

For European organizations, the primary impact of CVE-2025-54152 is the potential unauthorized disclosure of sensitive memory contents by an attacker who has gained user-level access. While the vulnerability does not allow privilege escalation or remote code execution, the exposure of sensitive information could facilitate further attacks or data breaches. Organizations relying on Qsync Central for file synchronization and collaboration may face risks related to confidentiality breaches, especially if sensitive corporate or personal data is stored or processed. The requirement for authenticated access reduces the likelihood of widespread exploitation but highlights the importance of strong user account management and monitoring. The low CVSS score indicates limited direct impact, but in regulated sectors such as finance, healthcare, or government within Europe, any data leakage could have compliance and reputational consequences. Therefore, timely patching and account security measures are essential to minimize risk.

1. Upgrade Qsync Central to version 5.0.0.4 or later immediately to apply the official patch addressing CVE-2025-54152. 2. Enforce strong authentication policies, including multi-factor authentication (MFA), to reduce the risk of unauthorized account access. 3. Regularly audit user accounts and permissions to ensure only authorized users have access to Qsync Central. 4. Monitor logs and network traffic for unusual access patterns or attempts to exploit memory disclosure vulnerabilities. 5. Implement network segmentation to limit access to Qsync Central servers from untrusted networks. 6. Educate users about phishing and credential theft risks to prevent attackers from gaining initial access. 7. Consider deploying endpoint detection and response (EDR) solutions to detect suspicious activities related to memory access or exploitation attempts. 8. Maintain an incident response plan that includes procedures for handling potential data disclosure incidents.