CVE-2020-5665 Denial of service in MELSEC iQ-F series FX5U(C) CPU unit
An attacker can cause a denial-of-service condition on Mitsubishi MELSEC PLCs by sending a specially crafted ARP packet.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-5665?
CVE-2020-5665 is a high-severity denial of service vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F series FX5U(C) CPU unit, published on 14 Dec 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Improper check or handling of exceptional conditions in MELSEC iQ-F series FX5U(C) CPU unit firmware version 1.060 and earlier allows an attacker to cause a denial-of-service (DoS) condition on program execution and communication by sending a specially crafted ARP packet.
Which versions are affected by CVE-2020-5665?
It affects 1 product.
Products include Mitsubishielectric Melsec Iq-F Fx5u Cpu Firmware.
How do I fix CVE-2020-5665?
No fix has been published for CVE-2020-5665 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-2020-5665 being exploited?
There is no known exploitation of CVE-2020-5665 in the wild and no public exploit code.
Sources
Also known as GHSA-r9xw-pv6r-fxr3.