High severity7.5NVD Advisory· Published Jun 11, 2021· Updated Jun 17, 2026
CVE-2021-20591
CVE-2021-20591
Description
Uncontrolled Resource Consumption vulnerability in Mitsubishi Electric MELSEC iQ-R series CPU modules (R00/01/02CPU all versions, R04/08/16/32/120(EN)CPU all versions, R08/16/32/120SFCPU all versions, R08/16/32/120PCPU all versions, R08/16/32/120PSFCPU all versions) allows a remote unauthenticated attacker to prevent legitimate clients from connecting to the MELSOFT transmission port (TCP/IP) by not closing a connection properly, which may lead to a denial of service (DoS) condition.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
22- Mitsubishi Electric/MELSEC iQ-R series CPU modulesdescription
- Range: all versions
- cpe:2.3:o:mitsubishielectric:r00cpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r01cpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r02cpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r04cpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r08cpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r16cpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r32cpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r120cpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r08sfcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r16sfcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r32sfcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r120sfcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r08pcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r16pcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r32pcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r120pcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r08psfcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r16psfcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r32psfcpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:mitsubishielectric:r120psfcpu_firmware:*:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
2- jvn.jp/vu/JVNVU98060539/index.htmlnvdThird Party Advisory
- www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-003_en.pdfnvdVendor Advisory
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