CVE-2019-5077 Denial of service in WAGO PFC100
An attacker can send unauthenticated packets to cause a denial of service in WAGO PFC controllers, 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-2019-5077?
CVE-2019-5077 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-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.
Weakness: CWE-306
Which versions are affected by CVE-2019-5077?
It affects 2 products.
Products include Wago Pfc 100 Firmware, Wago Pfc 200 Firmware.
How do I fix CVE-2019-5077?
No fix has been published for CVE-2019-5077 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-2019-5077 being exploited?
There is no known exploitation of CVE-2019-5077 in the wild and no public exploit code.
Other vulnerabilities in WAGO PFC100
Sources
Also known as GHSA-wg4r-4x32-rpwp.