Is CVE-2019-5074 actively exploited?

No active exploitation of CVE-2019-5074 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2019-5074 be exploited remotely?

Yes. CVE-2019-5074 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2019-5074?

CVE-2019-5074 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2019-5074

CRITICAL

CVE-2019-5074

CWE-787Published: December 18, 2019· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2019-5074 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.