CVE-2025-2848: Synology Mail Server Vulnerability Allows Remote Configuration Tampering
do son 
A recently disclosed vulnerability in Synology Mail Server could allow remote authenticated attackers to tamper with system configurations, potentially impacting the stability of mail services in enterprise and home NAS deployments.
Tracked as CVE-2025-2848, the flaw has been assigned a CVSS v3 base score of 6.3, indicating a moderate severity level. While not considered critical, this vulnerability could be leveraged by an insider threat or a compromised user account to interfere with service functionality.
“A vulnerability in Synology Mail Server allows remote authenticated attackers to read and write non-sensitive settings, and disable some non-critical functions,” according to Synology’s official advisory.
The issue affects Synology Mail Server running on the following DiskStation Manager (DSM) versions:
- DSM 7.2 — Fixed in version 1.7.6-20676
- DSM 7.1 — Fixed in version 1.7.6-10676
At the time of writing, no mitigation exists other than applying the recommended updates.
While the vulnerability requires an attacker to be authenticated, the ability to alter system settings or disable functions—albeit non-critical—could be used in targeted denial-of-service scenarios, misconfiguration attacks, or lateral movement efforts within compromised environments.
This becomes particularly relevant in multi-user NAS environments, where mail server access is delegated to multiple users or integrated with directory services.
Synology urges users to:
- Upgrade immediately to the fixed versions (1.7.6-20676+ or 1.7.6-10676+ depending on DSM version)
- Audit user accounts and permissions, especially if mail services are accessible over external networks
- Enable multi-factor authentication (MFA) where possible to reduce risk from compromised credentials
Related Posts:
- Synology Issues Patches for Critical Camera Flaws Discovered at Pwn2Own
- Critical Flaw in Synology Camera Firmware Expose Devices to RCE and DoS Attacks
- Synology Camera Critical Vulnerabilities Patched: Upgrade Immediately
- CVE-2024-10442: Synology Replication Service Vulnerability Scores Maximum CVSS Rating
- CVE-2024-10441 (CVSS 9.8): Synology Patches Critical Code Execution Flaw in Multiple Products
