CVE-2017-7937: Phoenix Contact GmbH Mguard Firmware

Medium severity, CVSS 4.0. EPSS: 0.7% chance of exploitation in the next 30 days.

An Improper Authentication issue was discovered in Phoenix Contact GmbH mGuard firmware versions 8.3.0 to 8.4.2. An attacker may be able to gain unauthorized access to the user firewall when RADIUS servers are unreachable.

Affected products

• Phoenix Contact GmbH Mguard Firmware: version 8.3.0 only; version 8.3.1 only; version 8.3.2 only; version 8.4.0 only; version 8.4.1 only; version 8.4.2 only

Published 2017-05-19. Last modified 2026-06-17.