What is CVE-2020-5668?

CVE-2020-5668 is a high-severity vulnerability in Mitsubishielectric R00cpu, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2020-11-20.

How severe is CVE-2020-5668?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Mitsubishielectric R00cpu

CVE-2020-5668

Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series modules (R00/01/02CPU firmware version '19' and earlier, R04/08/16/32/120 (EN) CPU firmware version '51' and earlier, R08/16/32/120SFCPU firmware version '22' and earlier, R08/16/32/120PCPU firmware version '25' and earlier, R08/16/32/120PSFCPU firmware version '06' and earlier, RJ71EN71 firmware version '47' and earlier, RJ71GF11-T2 firmware version '47' and earlier, RJ72GF15-T2 firmware version '07' and earlier, RJ71GP21-SX firmware version '47' and earlier, RJ71GP21S-SX firmware version '47' and earlier, and RJ71GN11-T2 firmware version '11' and earlier) allows a remote unauthenticated attacker to cause an error in a CPU unit and cause a denial-of-service (DoS) condition in execution of the program and its communication, or to cause a denial-of-service (DoS) condition in communication via the unit by receiving a specially crafted SLMP packet

Vulnerability class: DoS (Denial of Service)

Published 2020-11-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.049 (91.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 91.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.049 · newest: 0.049 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-016.pdf (Vendor Advisory)
www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-016_en.pdf (Vendor Advisory)
us-cert.cisa.gov/ics/advisories/icsa-20-324-05 (US Government Resource, Third Party Advisory)
jvn.jp/vu/JVNVU95980140/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2020-5668?: CVE-2020-5668 is a high-severity vulnerability in Mitsubishielectric R00cpu, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2020-11-20.
How severe is CVE-2020-5668?: High severity. CVSS v3 base score is 7.5 out of 10.