How severe is CVE-2020-5603?

CVE-2020-5603 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-5603 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-5603?

CVE-2020-5603 primarily affects Mitsubishielectric Cpu Module Logging Configuration Tool. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-5603?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-5603 published?

CVE-2020-5603 was published on 2020-06-30 and last updated on 2026-06-17.

CVE-2020-5603

CVE-2020-5603 is a high-severity vulnerability in Mitsubishielectric Cpu Module Logging Configuration Tool with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Mitsubishielectric Cpu Module Logging Configuration Tool
Published: 2020-06-30
Last modified: 2026-06-17

Description

Uncontrolled resource consumption vulnerability in Mitsubishi Electoric FA Engineering Software (CPU Module Logging Configuration Tool Ver. 1.94Y and earlier, CW Configurator Ver. 1.010L and earlier, EM Software Development Kit (EM Configurator) Ver. 1.010L and earlier, GT Designer3 (GOT2000) Ver. 1.221F and earlier, GX LogViewer Ver. 1.96A and earlier, GX Works2 Ver. 1.586L and earlier, GX Works3 Ver. 1.058L and earlier, M_CommDTM-HART Ver. 1.00A, M_CommDTM-IO-Link Ver. 1.02C and earlier, MELFA-Works Ver. 4.3 and earlier, MELSEC-L Flexible High-Speed I/O Control Module Configuration Tool Ver.1.004E and earlier, MELSOFT FieldDeviceConfigurator Ver. 1.03D and earlier, MELSOFT iQ AppPortal Ver. 1.11M and earlier, MELSOFT Navigator Ver. 2.58L and earlier, MI Configurator Ver. 1.003D and earlier, Motion Control Setting Ver. 1.005F and earlier, MR Configurator2 Ver. 1.72A and earlier, MT Works2 Ver. 1.156N and earlier, RT ToolBox2 Ver. 3.72A and earlier, and RT ToolBox3 Ver. 1.50C and earlier) allows an attacker to cause a denial of service (DoS) condition attacks via unspecified vectors.

Frequently asked questions

What is CVE-2020-5603?: Uncontrolled resource consumption vulnerability in Mitsubishi Electoric FA Engineering Software (CPU Module Logging Configuration Tool Ver. 1.94Y and earlier, CW Configurator Ver. 1.010L and earlier, EM Software Development Kit (EM Configurator) Ver. 1.010L and earlier, GT Designer3 (GOT2000) Ver. 1.221F and earlier, GX LogViewer Ver. 1.96A and earlier, GX Works2 Ver. 1.586L and earlier, GX Works3 Ver. 1.058L and earlier, M_CommDTM-HART Ver. 1.00A, M_CommDTM-IO-Link Ver. 1.02C and earlier, MELFA-Works Ver. 4.3 and earlier, MELSEC-L Flexible High-Speed I/O Control Module Configuration Tool Ver.1.004E and earlier, MELSOFT FieldDeviceConfigurator Ver. 1.03D and earlier, MELSOFT iQ AppPortal Ver. 1.11M and earlier, MELSOFT Navigator Ver. 2.58L and earlier, MI Configurator Ver. 1.003D and earlier, Motion Control Setting Ver. 1.005F and earlier, MR Configurator2 Ver. 1.72A and earlier, MT Works2 Ver. 1.156N and earlier, RT ToolBox2 Ver. 3.72A and earlier, and RT ToolBox3 Ver. 1.50C and earlier) allows an attacker to cause a denial of service (DoS) condition attacks via unspecified vectors.
How severe is CVE-2020-5603?: CVE-2020-5603 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-5603 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-5603?: CVE-2020-5603 primarily affects Mitsubishielectric Cpu Module Logging Configuration Tool. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-5603?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-5603 published?: CVE-2020-5603 was published on 2020-06-30 and last updated on 2026-06-17.

References

Affected products (20)

cpe:2.3:a:mitsubishielectric:cpu_module_logging_configuration_tool:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:cw_configurator:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:em_configurator:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:gt_designer3:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:gx_logviewer:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:gx_works2:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:gx_works3:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:m_commdtm-hart:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:m_commdtm-io-link:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:melfa-works:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:melsec-l_flexible_high-speed_i\/o_control_module_configuration_tool:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:melsoft_fielddeviceconfigurator:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:melsoft_iq_appportal:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:melsoft_navigator:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:mi_configurator:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:motion_control_setting:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:mr_configurator2:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:mt_works2:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:rt_toolbox2:*:*:*:*:*:*:*:*
cpe:2.3:a:mitsubishielectric:rt_toolbox3:*:*:*:*:*:*:*:*

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