What is CVE-2020-5543?

CVE-2020-5543 is a vulnerability in the TCP function of Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware version 1.0.7 and earlier.

How severe is CVE-2020-5543?

CVE-2020-5543 has a severity rating of 9.8 out of 10, making it a critical vulnerability.

How can I fix the CVE-2020-5543 vulnerability?

To mitigate the CVE-2020-5543 vulnerability, it is recommended to apply the firmware update provided by Mitsubishi Electric.

Vulnerability/
CVE-2020-5543

critical

9.8

CWE

384

16/3/2020

4/8/2024

CVE-2020-5543

Q: How does CVE-2020-5543 affect Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware?

CVE-2020-5543 allows remote attackers to stop the network functions or execute malware through a specially crafted packet.

Q: Is Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware version 1.0.7 and earlier vulnerable?

Yes, Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware version 1.0.7 and earlier are vulnerable to CVE-2020-5543.

First published: Mon Mar 16 2020(Updated: )

TCP function included in the firmware of Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware version 1.0.7 and earlier does not properly manage sessions, which allows remote attackers to stop the network functions or execute malware via a specially crafted packet.

Credit: vultures@jpcert.or.jp

Affected Software	Affected Version	How to fix
Mitsubishielectric Iu1-1m20-d Firmware	<=1.0.7
Mitsubishielectric Iu1-1m20-d

Remedy

https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2019-004.pdf

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Reference Links

Frequently Asked Questions

What is CVE-2020-5543?
CVE-2020-5543 is a vulnerability in the TCP function of Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware version 1.0.7 and earlier.
How severe is CVE-2020-5543?
CVE-2020-5543 has a severity rating of 9.8 out of 10, making it a critical vulnerability.
How does CVE-2020-5543 affect Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware?
CVE-2020-5543 allows remote attackers to stop the network functions or execute malware through a specially crafted packet.
Is Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware version 1.0.7 and earlier vulnerable?
Yes, Mitsubishi Electric MELQIC IU1 series IU1-1M20-D firmware version 1.0.7 and earlier are vulnerable to CVE-2020-5543.
How can I fix the CVE-2020-5543 vulnerability?
To mitigate the CVE-2020-5543 vulnerability, it is recommended to apply the firmware update provided by Mitsubishi Electric.

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canonical/mitsubishielectric iu1-1m20-d firmware
version/mitsubishielectric iu1-1m20-d firmware/1.0.7
canonical/mitsubishielectric iu1-1m20-d

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