CVE-2020-5545

Name: CVE-2020-5545
Creator: NVD / NIST
Published: 2020-03-16T02:15:11.057+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.29%

Last modified Jun 17, 2026

CVE-2020-5545 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. TCP function included in the firmware of Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware version 1.0.7 and earlier allows remote attackers to bypass access restriction and to stop the network functions or execute malware via a specially crafted packet.. EPSS estimates a 2.29% chance of exploitation in the next 30 days.

Description

TCP function included in the firmware of Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware version 1.0.7 and earlier allows remote attackers to bypass access restriction and to stop the network functions or execute malware via a specially crafted packet.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.29%

81.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Mitsubishielectric	Iu1-1m20-D Firmware	<= 1.0.7

References

https://jvn.jp/en/vu/JVNVU92370624/index.htmlThird Party Advisory
https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2019-004.pdfPatch, Vendor Advisory
https://jvn.jp/en/vu/JVNVU92370624/index.htmlThird Party Advisory
https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2019-004.pdfPatch, Vendor Advisory

Timeline

Published: Mar 16, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-5545?

How severe is CVE-2020-5545?

CVE-2020-5545 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.29% probability of exploitation in the next 30 days.

How do I fix CVE-2020-5545?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-5545?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST