Is CVE-2019-5078 actively exploited?

No active exploitation of CVE-2019-5078 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2019-5078 be exploited remotely?

Yes. CVE-2019-5078 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2019-5078?

CVE-2019-5078 has a CVSS score of 9.1 (CRITICAL).

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CRITICAL

CVE-2019-5078

CWE-306Published: December 18, 2019· Updated: Jun 17, 2026

9.1

CVSS v3.1

Official Description

An exploitable denial of service 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 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.

NVD Source

Technical Analysis

CVE-2019-5078 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 full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.1.