CVE-2021-20599 Information disclosure in MELSEC iQ-R Series SIL2 Process CPU R08PSFCPU

Critical 9.1 Published 14 Oct 2021 Updated 3 Aug 2024

Remote attackers can intercept cleartext credentials to gain unauthorized access to Mitsubishi MELSEC iQ-R safety and process CPU modules.

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-2021-20599?

CVE-2021-20599 is a critical vulnerability in Mitsubishi Electric Corporation MELSEC iQ-R Series SIL2 Process CPU R08PSFCPU, published on 14 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Cleartext Transmission of Sensitive InformationCleartext transmission of sensitive information vulnerability in MELSEC iQ-R series Safety CPU R08/16/32/120SFCPU firmware versions "26" and prior and MELSEC iQ-R series SIL2 Process CPU R08/16/32/120PSFCPU firmware versions "11" and prior allows a remote unauthenticated attacker to login to a target CPU module by obtaining credentials other than password.

Weakness: CWE-639, CWE-319

Which versions are affected by CVE-2021-20599?

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-2021-20599?

No fix has been published for CVE-2021-20599 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-20599 being exploited?

There is no known exploitation of CVE-2021-20599 in the wild and no public exploit code.

Sources

Also known as GHSA-vf46-vqq9-hg36.