Is CVE-2020-5531 actively exploited?

No active exploitation of CVE-2020-5531 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-5531 be exploited remotely?

Yes. CVE-2020-5531 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-5531?

CVE-2020-5531 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2020-5531

CRITICAL

CVE-2020-5531

NVD-CWE-noinfoPublished: February 17, 2020· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2020-5531 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.