CVE-2021-20587: Mitsubishielectric C Controller Module Setting And Monitoring Tool

Critical severity, CVSS 9.8. EPSS: 3.9% chance of exploitation in the next 30 days.

Heap-based buffer overflow vulnerability in Mitsubishi Electric FA Engineering Software (CPU Module Logging Configuration Tool versions 1.112R and prior, CW Configurator versions 1.011M and prior, Data Transfer versions 3.44W and prior, EZSocket versions 5.4 and prior, FR Configurator all versions, FR Configurator SW3 all versions, FR Configurator2 versions 1.24A and prior, GT Designer3 Version1(GOT1000) versions 1.250L and prior, GT Designer3 Version1(GOT2000) versions 1.250L and prior, GT SoftGOT1000 Version3 versions 3.245F and prior, GT SoftGOT2000 Version1 versions 1.250L and prior, GX Configurator-DP versions 7.14Q and prior, GX Configurator-QP all versions, GX Developer versions 8.506C and prior, GX Explorer all versions, GX IEC Developer all versions, GX LogViewer versions 1.115U and prior, GX RemoteService-I all versions, GX Works2 versions 1.597X and prior, GX Works3 versions 1.070Y and prior, iQ Monozukuri ANDON (Data Transfer) versions 1.003D and prior, iQ Monozukuri Process Remote Monitoring (Data Transfer) versions 1.002C and prior, M_CommDTM-HART all versions, M_CommDTM-IO-Link versions 1.03D and prior, MELFA-Works versions 4.4 and prior, MELSEC WinCPU Setting Utility all versions, MELSOFT EM Software Development Kit (EM Configurator) versions 1.015R and prior, MELSOFT Navigator versions 2.74C and prior, MH11 SettingTool Version2 versions 2.004E and prior, MI Configurator versions 1.004E and prior, MT Works2 versions 1.167Z and prior, MX Component versions 5.001B and prior, Network Interface Board CC IE Control utility versions 1.29F and prior, Network Interface Board CC IE Field Utility versions 1.16S and prior, Network Interface Board CC-Link Ver.2 Utility versions 1.23Z and prior, Network Interface Board MNETH utility versions 34L and prior, PX Developer versions 1.53F and prior, RT ToolBox2 versions 3.73B and prior, RT ToolBox3 versions 1.82L and prior, Setting/monitoring tools for the C Controller module (SW4PVC-CCPU) versions 4.12N and prior, and SLMP Data Collector versions 1.04E and prior) allows a remote unauthenticated attacker to cause a DoS condition on the software products, and possibly to execute a malicious code on the personal computer running the software products although it has not been reproduced, by spoofing MELSEC, GOT or FREQROL and returning crafted reply packets.

Affected products

• Mitsubishielectric C Controller Module Setting And Monitoring Tool: any version
• Mitsubishielectric CPU Module Logging Configuration Tool: up to and including 1.112r
• Mitsubishielectric Cw Configurator: up to and including 1.011m
• Mitsubishielectric Data Transfer: up to and including 3.44w
• Mitsubishielectric Ezsocket: any version
• Mitsubishielectric Fr Configurator: any version
• Mitsubishielectric Fr CONFIGURATOR2: up to and including 1.24a
• Mitsubishielectric Fr Configurator SW3: any version
• Mitsubishielectric Gt DESIGNER3: up to and including 1.250l
• Mitsubishielectric Gt SOFTGOT1000: up to and including 3.245f
• Mitsubishielectric Gt SOFTGOT2000: up to and including 1.250l
• Mitsubishielectric Gx Configurator-Dp: up to and including 7.14q
• Mitsubishielectric Gx Configurator-Qp: any version
• Mitsubishielectric Gx Developer: up to and including 8.506c
• Mitsubishielectric Gx Explorer: any version
• Mitsubishielectric Gx Iec Developer: any version
• Mitsubishielectric Gx Logviewer: up to and including 1.115u
• Mitsubishielectric Gx Remoteservice-I: any version
• Mitsubishielectric Gx WORKS2: up to and including 1.597x
• Mitsubishielectric Gx WORKS3: up to and including 1.070y
• Mitsubishielectric Iq Monozukuri Andon: affected versions not specified
• Mitsubishielectric Iq Monozukuri Process Remote Monitoring: affected versions not specified
• Mitsubishielectric M Commdtm-Hart: any version
• Mitsubishielectric M Commdtm-Io-Link: any version
• Mitsubishielectric Melfa-Works: up to and including 4.4
• and 16 more

Published 2021-02-19. Last modified 2026-06-17.