Synology Mail Server Let Remote Attackers Tamper System Configurations

A moderate-severity vulnerability has been identified in Synology Mail Server. It allows remote authenticated attackers to read and write non-sensitive settings and disable certain non-critical functions. 

The security flaw, tracked as CVE-2025-2848, affects multiple versions of the popular mail server software and has prompted Synology to release security patches for affected systems.

Synology has assigned the vulnerability a CVSS Base Score of 6.3 with a vector of CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L, indicating moderate severity with potential for confidentiality, integrity, and availability impacts. 

The security flaw specifically enables remote authenticated attackers to manipulate system configurations without requiring user interaction. Security researcher Chanin Kim discovered and reported the vulnerability to Synology as part of their responsible disclosure program.

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While full technical details remain reserved until widespread patching has occurred, this type of vulnerability typically involves improper access control mechanisms that fail to properly restrict authenticated users from accessing or modifying configuration settings beyond their intended privileges.

The summary of the vulnerability is given below:

Affected Products and Remediation

The vulnerability impacts the following products:

• Synology Mail Server for DSM 7.2 (fixed in version 1.7.6-20676 or above)
• Synology Mail Server for DSM 7.1 (fixed in version 1.7.6-10676 or above)

Users are strongly advised to update their mail server installations immediately. No alternative mitigation strategies have been identified, making the software update the only effective protection against potential exploitation.

This security issue emerges amid ongoing cybersecurity concerns for network-attached storage (NAS) devices and related services. 

In 2024, Synology addressed 13 security vulnerabilities across its product line. Earlier this year, Synology also patched multiple vulnerabilities in its SRM (Synology Router Manager) software that allowed authenticated users to read or write non-sensitive files.

The company has historically been proactive in addressing security flaws.

Last year, Taiwanese security firm QI-ANXIN Group’s Codesafe Team identified multiple vulnerabilities in Synology products, demonstrating the ongoing attention these systems receive from security researchers.

Synology product users should:

• Immediately update to the patched versions specified in the advisory.
• Consider implementing additional security measures like geo-blocking to limit access to authorized regions.
• Enable two-factor authentication for all administrator accounts.
• Configure automatic security notifications to stay informed of failed login attempts or unusual activities.

Synology follows responsible disclosure practices and does not publicly announce security vulnerabilities until fixes are available. 

As with all security updates, administrators should test the patched versions in non-production environments before deploying them to critical systems.

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