CVE-2019-5167: Wago PFC200 Firmware

High severity, CVSS 7.8. EPSS: 1.2% chance of exploitation in the next 30 days.

An exploitable command injection vulnerability exists in the iocheckd service ‘I/O-Check’ function of the WAGO PFC 200 version 03.02.02(14). At 0x1e3f0 the extracted dns value from the xml file is used as an argument to /etc/config-tools/edit_dns_server %s dns-server-nr=%d dns-server-name=<contents of dns node> using sprintf(). This command is later executed via a call to system(). This is done in a loop and there is no limit to how many dns entries will be parsed from the xml file.

Affected products

• Wago PFC200 Firmware: version 03.02.02(14) only

Published 2020-03-11. Last modified 2026-06-17.