CVE-2020-5656 — CRITICAL (9.8)

Vulnerability Description

Improper access control 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 or execute a malicious program via a specially crafted packet.

CVSS Score

9.8

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
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	-

References

https://jvn.jp/vu/JVNVU92513419/index.htmlThird Party Advisory
https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-012.pdfVendor Advisory
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-012_en.pdfVendor Advisory
https://jvn.jp/vu/JVNVU92513419/index.htmlThird Party Advisory
https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-012.pdfVendor Advisory
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-012_en.pdfVendor Advisory

FAQ

What is CVE-2020-5656?

CVE-2020-5656 is a vulnerability with a CVSS score of 9.8 (CRITICAL). Improper access control 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 befo...

How severe is CVE-2020-5656?

CVE-2020-5656 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2020-5656?

Check the references section above for vendor advisories and patch information. Affected products include: Mitsubishielectric Melsec Iq-Rj71Eip91 Firmware, Mitsubishielectric Melsec Iq-Rj71Eip91, Mitsubishielectric Melsec Iq-Rj71Pn92 Firmware, Mitsubishielectric Melsec Iq-Rj71Pn92, Mitsubishielectric Melsec Iq-Rd81Dl96 Firmware.