CVE-2019-5078 Denial of service in WAGO PFC100

Critical 9.1 Published 18 Dec 2019 Updated 4 Aug 2024

Unauthenticated attackers can cause a denial of service in WAGO PFC controllers by sending crafted packets, halting network communications.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2019-5078?

CVE-2019-5078 is a critical denial of service vulnerability in WAGO PFC100, published on 18 Dec 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

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.

Weakness: CWE-306

Which versions are affected by CVE-2019-5078?

It affects 2 products.

Products include Wago Pfc 100 Firmware, Wago Pfc 200 Firmware.

How do I fix CVE-2019-5078?

No fix has been published for CVE-2019-5078 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-5078 being exploited?

There is no known exploitation of CVE-2019-5078 in the wild and no public exploit code.

Sources

Also known as GHSA-hjp3-mgv4-cwvx.