Mitsubishi MELSEC and MELIPC Denial Of Service (CVE-2020-5531)

critical Tenable OT Security Plugin ID 500600


The remote OT asset is affected by a vulnerability.


Mitsubishi Electric MELSEC C Controller Module and MELIPC Series MI5000 MELSEC-Q Series C Controller Module(Q24DHCCPU-V, Q24DHCCPU-VG User Ethernet port (CH1, CH2): First 5 digits of serial number 21121 or before), MELSEC iQ-R Series C Controller Module / C Intelligent Function Module(R12CCPU-V Ethernet port (CH1, CH2): First 2 digits of serial number 11 or before, and RD55UP06-V Ethernet port: First 2 digits of serial number 08 or before), and MELIPC Series MI5000(MI5122-VW Ethernet port (CH1): First 2 digits of serial number 03 or before, or the firmware version 03 or before) allow remote attackers to cause a denial of service and/or malware being executed via unspecified vectors.
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Refer to the vendor advisory.

See Also

Plugin Details

Severity: Critical

ID: 500600

Version: 1.4

Type: remote

Family: Tenable.ot

Published: 2/7/2022

Updated: 11/13/2023

Risk Information


Risk Factor: Medium

Score: 5.9


Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2020-5531


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:mitsubishielectric:mi5122-vw_firmware, cpe:/o:mitsubishielectric:q24dhccpu-v_firmware, cpe:/o:mitsubishielectric:q24dhccpu-vg_firmware, cpe:/o:mitsubishielectric:r12ccpu-v_firmware, cpe:/o:mitsubishielectric:rd55up06-v_firmware

Required KB Items: Tenable.ot/Mitsubishi

Exploit Ease: No known exploits are available

Patch Publication Date: 2/17/2020

Vulnerability Publication Date: 2/17/2020

Reference Information

CVE: CVE-2020-5531