CVE-2019-5074

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: none known
Published: 2019-12-18 · updated 2026-06-17
Weakness: CWE-787

Description

An exploitable stack buffer overflow vulnerability exists in the iocheckd service ''I/O-Check'' functionality of WAGO PFC200 Firmware version 03.01.07(13), WAGO PFC200 Firmware version 03.00.39(12) and WAGO PFC100 Firmware version 03.00.39(12). A specially crafted set of packets can cause a stack buffer overflow, 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: 03.01.07(13)

References

https://talosintelligence.com/vulnerability_reports/TALOS-2019-0863
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0863

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