CVE-2020-5666 Denial of service in MELSEC iQ-R Series CPU Modules
Remote attackers can cause denial of service in Mitsubishi MELSEC iQ-R CPU modules via crafted HTTP packets, disrupting industrial control operations.
- 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-2020-5666?
CVE-2020-5666 is a high-severity denial of service vulnerability in Mitsubishi Electric Corporation MELSEC iQ-R Series CPU Modules, published on 16 Nov 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series CPU Modules (R00/01/02CPU Firmware versions from '05' to '19' and R04/08/16/32/120(EN)CPU Firmware versions from '35' to '51') allows a remote attacker to cause an error in a CPU unit via a specially crafted HTTP packet, which may lead to a denial-of-service (DoS) condition in execution of the program and its communication.
Weakness: CWE-400
Which versions are affected by CVE-2020-5666?
It affects 8 products.
Products include Mitsubishielectric Melsec Iq-R00 Firmware, Mitsubishielectric Melsec Iq-R01 Firmware, Mitsubishielectric Melsec Iq-R02 Firmware, Mitsubishielectric Melsec Iq-R04 Firmware, Mitsubishielectric Melsec Iq-R08 Firmware, Mitsubishielectric Melsec Iq-R120 Firmware and 2 more.
How do I fix CVE-2020-5666?
No fix has been published for CVE-2020-5666 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-2020-5666 being exploited?
There is no known exploitation of CVE-2020-5666 in the wild and no public exploit code.
Sources
Also known as GHSA-5527-cm29-m2f3.