CVE-2021-20594 Information disclosure in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU; Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU

High 7.5 Published 6 Aug 2021 Updated 3 Aug 2024

Remote attackers can brute-force user names on Mitsubishi MELSEC iQ-R Safety and SIL2 Process CPU modules, exposing sensitive account information.

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-2021-20594?

CVE-2021-20594 is a high-severity vulnerability in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU; Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU, published on 6 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU firmware versions "26" and prior and Mitsubishi Electric MELSEC iQ-R series SIL2 Process CPU modules R08/16/32/120PSFCPU firmware versions "11" and prior allows a remote unauthenticated attacker to acquire legitimate user names registered in the module via brute-force attack on user names.

Weakness: CWE-200

Which versions are affected by CVE-2021-20594?

It affects 8 products.

Products include Mitsubishielectric R08psfcpu Firmware, Mitsubishielectric R08sfcpu Firmware, Mitsubishielectric R120psfcpu Firmware, Mitsubishielectric R120sfcpu Firmware, Mitsubishielectric R16psfcpu Firmware, Mitsubishielectric R16sfcpu Firmware and 2 more.

How do I fix CVE-2021-20594?

No fix has been published for CVE-2021-20594 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-20594 being exploited?

There is no known exploitation of CVE-2021-20594 in the wild and no public exploit code.

Sources

Also known as GHSA-3852-pg93-43w3.