CRITICAL

CVE-2019-5079

CVSS v3

9.8

CRITICAL

EPSS Score

3.3 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-20-065-01 CISA4 known affected
WAGO I/O-CHECK
Series PFC200: (750-82xx/xxx-xxx) · I/O-CHECK Series PFC100 and Series PFC200: 750-823 750-832/xxx-xxx 750-862 750-890/xxx-xxx 750-891 · Series PFC100: (750-81xx/xxx-xxx)

Full record on NVD

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.

Technical details

Published: 2019-12-18

Frequently asked questions

What is CVE-2019-5079?

Is CVE-2019-5079 actively exploited?

Active exploitation of CVE-2019-5079 has not been confirmed. Its EPSS score was 3.3% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-5079?

CVE-2019-5079 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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