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Vulnerability · Published Oct 14, 2021 · Assigned by Mitsubishi

CVE-2021-20599

Critical 9.1

In plain English

A critical-severity security flaw in MELSEC iQ-R Series Safety CPU R08SFCPU from Mitsubishi Electric Corporation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 73% of all known vulnerabilities).

Severity (CVSS 3.1)9.1Critical
Exploit odds (30 days)1.4%top 27.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected products (as reported)

VendorProductVersions
Mitsubishi Electric Corporation MELSEC iQ-R Series Safety CPU R08SFCPU Firmware versions "26" and prior
Mitsubishi Electric Corporation MELSEC iQ-R series Safety CPU R16SFCPU Firmware versions "26" and prior
Mitsubishi Electric Corporation MELSEC iQ-R series Safety CPU R32SFCPU Firmware versions "26" and prior
Mitsubishi Electric Corporation MELSEC iQ-R series Safety CPU R120SFCPU Firmware versions "26" and prior
Mitsubishi Electric Corporation MELSEC iQ-R Series SIL2 Process CPU R08PSFCPU Firmware versions "11" and prior
Mitsubishi Electric Corporation MELSEC iQ-R series SIL2 Process CPU R16PSFCPU Firmware versions "11" and prior
Mitsubishi Electric Corporation MELSEC iQ-R series SIL2 Process CPU R32PSFCPU Firmware versions "11" and prior
Mitsubishi Electric Corporation MELSEC iQ-R series SIL2 Process CPU R120PSFCPU Firmware versions "11" and prior

Weakness: CWE-319 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References