Resource exhaustion in Mitsubishi Electric products - CVE-2021-20609

Vulnerability identifier: #VU58464

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-20609

CWE-ID: CWE-400

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

MELSEC-Q Q03UDECPU
MELSEC iQ-Q 13 UDVCPU
MELSEC iQ-Q 26 UDVCPU
MELSEC iQ-Q 04 UDEHCPU
MELSEC iQ-Q 06 UDEHCPU
MELSEC iQ-Q 10 UDEHCPU
MELSEC iQ-Q 13 UDEHCPU
MELSEC iQ-Q 20 UDEHCPU
MELSEC iQ-Q 26 UDEHCPU
MELSEC iQ-Q 50 UDEHCPU
MELSEC iQ-Q 100 UDEHCPU
MELSEC iQ-Q 06 UDVCPU
MELSEC iQ-R 16 MTCPU
MELSEC iQ-R 32 MTCPU
MELSEC iQ-R 64 MTCPU
MELSEC iQ-R 08 PSFCPU
MELSEC iQ-R 00 CPU
MELSEC iQ-R 32 PSFCPU
MELSEC iQ-R 120 PSFCPU
MELSEC iQ-R 08 PCPU
MELSEC Q Series Q172 DCPU-S1
MELIPC Series MI5122-VW
MELSEC L Series L02(-P)
MELSEC L Series L06(-P)
MELSEC L Series L26CPU(-P)
MELSEC L Series L26CPU-(P)BT
MELSEC Q Series Q170MSCPU(-S1)
MELSEC Q Series Q170MCPU
MELSEC iQ-Q 172 DSCPU
MELSEC iQ-Q 173 DSCPU
MELSEC Q Series Q173DCPU-S1
MELSEC iQ-R 16 PSFCPU
MELSEC iQ-Q MR-MQ100
MELSEC Q Series Q24/26DHCCPU-LS
MELSEC Q Series Q24DHCCPU-V(G)
MELSEC Q Series Q12DCCPU-V
MELSEC iQ-Q 04 UDPVCPU
MELSEC iQ-Q 06 UDPVCPU
MELSEC iQ-Q 13 UDPVCPU
MELSEC iQ-Q 26 UDPVCPU
MELSEC iQ-Q 03 UDVCPU
MELSEC iQ-Q 04 UDVCPU
MELSEC iQ-R 08 (EN) CPU
MELSEC iQ-R 04 (EN) CPU
MELSEC iQ-R 32 PCPU
MELSEC iQ-R 16 PCPU
MELSEC iQ-R 120 PCPU
MELSEC iQ-Q 172 DCPU-S1
MELSEC iQ-R 02 CPU
MELSEC iQ-R 01 CPU
MELSEC iQ-R 16 (EN) CPU
MELSEC iQ-R 32 (EN) CPU
MELSEC iQ-R 120 (EN) CPU
MELSEC iQ-R 08 SFCPU
MELSEC iQ-R 16 SFCPU
MELSEC iQ-R 32 SFCPU
MELSEC iQ-R 120 SFCPU

Install updates from vendor's website.

MELSEC iQ-Q 13 UDVCPU - update to 23072
MELSEC iQ-Q 26 UDVCPU - update to 23072
MELSEC iQ-Q 06 UDVCPU - update to 23072
MELSEC iQ-R 00 CPU - update to 25
MELSEC iQ-R 08 PCPU - update to 30
MELSEC iQ-Q 04 UDPVCPU - update to 23072
MELSEC iQ-Q 06 UDPVCPU - update to 23072
MELSEC iQ-Q 13 UDPVCPU - update to 23072
MELSEC iQ-Q 26 UDPVCPU - update to 23072
MELSEC iQ-Q 03 UDVCPU - update to 23072
MELSEC iQ-Q 04 UDVCPU - update to 23072
MELSEC iQ-R 08 (EN) CPU - update to 58
MELSEC iQ-R 04 (EN) CPU - update to 58
MELSEC iQ-R 32 PCPU - update to 30
MELSEC iQ-R 16 PCPU - update to 30
MELSEC iQ-R 120 PCPU - update to 30
MELSEC iQ-R 02 CPU - update to 25
MELSEC iQ-R 01 CPU - update to 25
MELSEC iQ-R 16 (EN) CPU - update to 58
MELSEC iQ-R 32 (EN) CPU - update to 58
MELSEC iQ-R 120 (EN) CPU - update to 58

• https://ics-cert.us-cert.gov/advisories/icsa-21-334-02
• https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-019_en.pdf

• Multiple vulnerabilities in Mitsubishi Electric MELSEC and MELIPC Series