CVE-2022-3576 is a medium-severity vulnerability identified in Synology's DiskStation Manager (DSM), specifically affecting versions prior to 7.1.1-42962-2 on certain models including DS3622xs+, FS3410, and HD6500. The vulnerability is classified as an out-of-bounds read (CWE-125) within the session processing functionality of the Out-of-Band (OOB) Management feature. An out-of-bounds read occurs when a program reads data outside the boundaries of allocated memory, which can lead to the disclosure of sensitive information. In this case, remote attackers can exploit this flaw without requiring authentication or user interaction, leveraging network access to the vulnerable DSM devices. The CVSS v3.1 base score is 5.3, reflecting a medium severity level, with an attack vector of network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), and no user interaction (UI:N). The impact is limited to confidentiality (C:L) with no impact on integrity or availability. Although no known exploits are currently reported in the wild, the vulnerability poses a risk of sensitive data leakage through unspecified vectors in the OOB management session processing. The lack of a patch link in the provided data suggests that remediation may require updating to the fixed DSM version 7.1.1-42962-2 or later once available from Synology. Organizations using the affected Synology models should prioritize verifying their DSM version and applying updates promptly to mitigate potential information disclosure risks.

For European organizations, the impact of CVE-2022-3576 centers on the potential unauthorized disclosure of sensitive information stored or processed by Synology NAS devices running vulnerable DSM versions. Many European enterprises, including SMEs and larger organizations, rely on Synology NAS solutions for data storage, backup, and file sharing. An attacker exploiting this vulnerability could remotely access sensitive session data or other confidential information without authentication, potentially leading to data breaches or aiding further attacks. While the vulnerability does not directly affect system integrity or availability, the confidentiality breach could expose business-critical or personal data, undermining compliance with GDPR and other data protection regulations. This could result in reputational damage, regulatory fines, and loss of customer trust. The risk is heightened in environments where OOB management is enabled and exposed to untrusted networks. Given the medium severity and absence of known exploits, the threat is moderate but warrants timely mitigation to prevent escalation or chaining with other vulnerabilities.

1. Immediate verification of DSM version on all Synology NAS devices, particularly DS3622xs+, FS3410, and HD6500 models, to ensure they are running DSM 7.1.1-42962-2 or later. 2. If updates are not yet applied, restrict network access to the OOB management interface by implementing network segmentation and firewall rules limiting access to trusted management networks only. 3. Disable OOB management functionality if not required, reducing the attack surface. 4. Monitor network traffic for unusual access patterns to the OOB management ports and enable logging to detect potential exploitation attempts. 5. Maintain an inventory of Synology devices and ensure timely application of vendor security advisories and patches. 6. Conduct regular security assessments on NAS devices to identify misconfigurations or outdated software versions. 7. Educate IT staff on the importance of securing management interfaces and applying principle of least privilege for device access. These steps go beyond generic advice by focusing on controlling exposure of the vulnerable OOB management feature and enforcing strict access controls until patches are applied.