What is CVE-2020-5527?

CVE-2020-5527 is a high-severity vulnerability in Mitsubishielectric Cr800-Q, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2020-03-30.

How severe is CVE-2020-5527?

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

Resource exhaustion in Mitsubishielectric Cr800-Q

CVE-2020-5527

When MELSOFT transmission port (UDP/IP) of Mitsubishi Electric MELSEC iQ-R series (all versions), MELSEC iQ-F series (all versions), MELSEC Q series (all versions), MELSEC L series (all versions), and MELSEC F series (all versions) receives massive amount of data via unspecified vectors, resource consumption occurs and the port does not process the data properly. As a result, it may fall into a denial-of-service (DoS) condition. The vendor states this vulnerability only affects Ethernet communication functions.

Vulnerability class: DoS (Denial of Service)

Published 2020-03-30 · 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: 0.014 (70.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 70.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2019-005_en.pdf (Vendor Advisory)
jvn.jp/en/vu/JVNVU91553662/index.html (Third Party Advisory)

Frequently asked questions

What is CVE-2020-5527?: CVE-2020-5527 is a high-severity vulnerability in Mitsubishielectric Cr800-Q, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2020-03-30.
How severe is CVE-2020-5527?: High severity. CVSS v3 base score is 7.5 out of 10.