CVE-2021-34598: Phoenixcontact Fl Mguard 1102 Firmware

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

In Phoenix Contact FL MGUARD 1102 and 1105 in Versions 1.4.0, 1.4.1 and 1.5.0 the remote logging functionality is impaired by the lack of memory release for data structures from syslog-ng when remote logging is active

Affected products

• Phoenixcontact Fl Mguard 1102 Firmware: version 1.4.0 only; version 1.4.1 only; version 1.5.0 only
• Phoenixcontact Fl Mguard 1105 Firmware: version 1.4.0 only; version 1.4.1 only; version 1.5.0 only

Published 2021-11-10. Last modified 2026-06-17.