CVE-2022-43749 is a medium-severity vulnerability classified under CWE-269 (Improper Privilege Management) affecting Synology Presto File Server versions prior to 2.1.2-1601. The vulnerability arises from improper handling of privilege constraints in the summary report management functionality, allowing remote authenticated users to bypass security restrictions through unspecified vectors. The CVSS 3.1 base score is 4.3, reflecting a network attack vector with low attack complexity, requiring privileges but no user interaction, and impacting confidentiality only. Specifically, an attacker with valid credentials can exploit this flaw to gain unauthorized access to summary reports or related data that should be restricted, potentially exposing sensitive information. The vulnerability does not affect integrity or availability directly and does not require user interaction, making it a concern primarily for confidentiality breaches within environments using the affected Synology Presto File Server. No known exploits are currently reported in the wild, and no official patches or mitigation links were provided at the time of publication. The lack of detailed vectors suggests that the vulnerability may involve improper access control checks or privilege escalation within the application’s report management module, which could be leveraged by insiders or compromised accounts to access data beyond their authorization scope.

For European organizations, the impact of CVE-2022-43749 depends largely on the deployment of Synology Presto File Server within their infrastructure. Organizations using this product for file sharing and report management could face confidentiality risks if attackers exploit this vulnerability to access sensitive summary reports. This could lead to unauthorized disclosure of business-critical or personal data, potentially violating GDPR requirements and resulting in regulatory penalties. While the vulnerability does not directly affect system integrity or availability, the exposure of confidential data could undermine trust and lead to reputational damage. Given that exploitation requires authenticated access, the threat is more significant in environments with weak credential management or where insider threats are a concern. European enterprises in sectors such as finance, healthcare, and government, which often handle sensitive data and may use Synology products for file services, could be particularly impacted. The absence of known exploits reduces immediate risk but does not eliminate the potential for targeted attacks, especially in high-value environments.

To mitigate CVE-2022-43749 effectively, European organizations should: 1) Immediately verify the version of Synology Presto File Server in use and upgrade to version 2.1.2-1601 or later once available, as this is the fixed version. 2) Implement strict access controls and least privilege principles for user accounts with access to the Presto File Server, limiting the number of users who can authenticate and access summary report management features. 3) Enforce strong authentication mechanisms, including multi-factor authentication (MFA), to reduce the risk of credential compromise. 4) Monitor and audit access logs for unusual or unauthorized access attempts to summary reports or related resources. 5) Segment the network to isolate file servers from general user networks, reducing the attack surface. 6) If patching is delayed, consider temporary compensating controls such as disabling summary report management features or restricting access to trusted IP ranges. 7) Educate administrators and users about the risks of privilege escalation and the importance of safeguarding credentials. These targeted measures go beyond generic advice by focusing on controlling authenticated access and monitoring the specific vulnerable functionality.