high
7.5
CWE
476
Advisory Published
Updated

CVE-2020-5655: Null Pointer Dereference

First published: Mon Nov 02 2020(Updated: )

NULL pointer dereferences vulnerability in TCP/IP function included in the firmware of MELSEC iQ-R series (RJ71EIP91 EtherNet/IP Network Interface Module First 2 digits of serial number are '02' or before, RJ71PN92 PROFINET IO Controller Module First 2 digits of serial number are '01' or before, RD81DL96 High Speed Data Logger Module First 2 digits of serial number are '08' or before, RD81MES96N MES Interface Module First 2 digits of serial number are '04' or before, and RD81OPC96 OPC UA Server Module First 2 digits of serial number are '04' or before) allows a remote unauthenticated attacker to stop the network functions of the products via a specially crafted packet.

Credit: vultures@jpcert.or.jp

Affected SoftwareAffected VersionHow to fix
Mitsubishielectric Melsec Iq-rj71eip91 Firmware
Mitsubishielectric Melsec Iq-rj71eip91
Mitsubishielectric Melsec Iq-rj71pn92 Firmware
Mitsubishielectric Melsec Iq-rj71pn92
Mitsubishielectric Melsec Iq-rd81dl96 Firmware
Mitsubishielectric Melsec Iq-rd81dl96
Mitsubishielectric Melsec Iq-rd81mes96n Firmware
Mitsubishielectric Melsec Iq-rd81mes96n
Mitsubishielectric Melsec Iq-rd81opc96 Firmware
Mitsubishielectric Melsec Iq-rd81opc96

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2020-5655?

    The severity of CVE-2020-5655 is high with a CVSS score of 7.5.

  • How does CVE-2020-5655 affect MELSEC iQ-R series?

    CVE-2020-5655 affects MELSEC iQ-R series firmware versions RJ71EIP91, RJ71PN92, RD81DL96, RD81MES96N, and RD81OPC96.

  • What is the vulnerability description of CVE-2020-5655?

    CVE-2020-5655 is a NULL pointer dereferences vulnerability in the TCP/IP function included in the firmware of MELSEC iQ-R series.

  • How can I fix CVE-2020-5655?

    To fix CVE-2020-5655, update the affected firmware versions of MELSEC iQ-R series to the latest available version provided by Mitsubishi Electric.

  • Where can I find more information about CVE-2020-5655?

    You can find more information about CVE-2020-5655 on the official Mitsubishi Electric PSIRT website and the JVN database.

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