CVE-2019-5077

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.6% 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-306

Description

An exploitable denial-of-service vulnerability exists in the iocheckd service ‘’I/O-Chec’’ functionality of WAGO PFC 200 Firmware versions 03.01.07(13) and 03.00.39(12), and WAGO PFC 100 Firmware version 03.00.39(12). A specially crafted set of packets can cause a denial of service, resulting in the device entering an error state where it ceases all network communications. 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-2019-0869
https://talosintelligence.com/vulnerability_reports/TALOS-2019-0869

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