CVE-2025-0193: Moxa Mgate 5121 Series

Medium severity, CVSS 5.2. EPSS: 0.3% chance of exploitation in the next 30 days.

A stored Cross-site Scripting (XSS) vulnerability exists in the MGate 5121/5122/5123 Series firmware version v1.0 because of insufficient sanitization and encoding of user input in the "Login Message" functionality. An authenticated attacker with administrative access can exploit this vulnerability to inject malicious scripts that are continuously stored on the device. These scripts are executed when other users access the login page, potentially resulting in unauthorized actions or other impacts, depending on the user's privileges.

Affected products

• Moxa Mgate 5121 Series: version 1.0 only
• Moxa Mgate 5122 Series: version 1.0 only
• Moxa Mgate 5123 Series: version 1.0 only

Published 2025-01-15. Last modified 2026-06-17.