CVE-2019-5079

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-12-18 · updated 2026-06-17
Weakness: CWE-787

Description

An exploitable heap buffer overflow vulnerability exists in the iocheckd service "I/O-Check" functionality of WAGO PFC200 Firmware versions 03.01.07(13) and 03.00.39(12), and WAGO PFC100 Firmware version 03.00.39(12). A specially crafted set of packets can cause a heap buffer overflow, potentially resulting in code execution. An attacker can send unauthenticated packets to trigger this vulnerability.

Affected products

WAGO Pfc 100 Firmware: 03.00.39(12)
WAGO Pfc 200 Firmware: 03.00.39(12), 03.01.07(13)

References

https://talosintelligence.com/vulnerability_reports/TALOS-2019-0871
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0871

Get alerted when CVE-2019-5079 or the next vulnerability affects your stack