#VU53639 Resource exhaustion in Mitsubishi Electric products - CVE-2021-20591

Vulnerability identifier: #VU53639

Vulnerability risk: Medium

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2021-20591

CWE-ID: CWE-400

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
MELSEC iQ-R 00 CPU
MELSEC iQ-R 01 CPU
MELSEC iQ-R 02 CPU
MELSEC iQ-R 04 (EN) CPU
MELSEC iQ-R 08 (EN) 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
MELSEC iQ-R 32 PCPU
MELSEC iQ-R 16 PCPU
MELSEC iQ-R 08 PCPU
MELSEC iQ-R 120 PSFCPU
MELSEC iQ-R 32 PSFCPU
MELSEC iQ-R 16 PSFCPU
MELSEC iQ-R 08 PSFCPU

Software vendor:
Mitsubishi Electric

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

The vulnerability exists due to improper session management. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

• https://ics-cert.us-cert.gov/advisories/icsa-21-147-05