CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2021-20591
High (7.5) in mitsubishielectric. EPSS 1.5% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 1.5% chance of exploitation in the next 30 days; higher than 74% of CVEs (scores of 2026-10-31)
- CWE
- CWE-400
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mitsubishielectric:r00cpu_firmware
- mitsubishielectric:r01cpu_firmware
- mitsubishielectric:r02cpu_firmware
- mitsubishielectric:r04cpu_firmware
- mitsubishielectric:r08cpu_firmware
- mitsubishielectric:r08pcpu_firmware
- mitsubishielectric:r08psfcpu_firmware
- mitsubishielectric:r08sfcpu_firmware
- mitsubishielectric:r120cpu_firmware
- mitsubishielectric:r120pcpu_firmware
- mitsubishielectric:r120psfcpu_firmware
- mitsubishielectric:r120sfcpu_firmware
- mitsubishielectric:r16cpu_firmware
- mitsubishielectric:r16pcpu_firmware
- mitsubishielectric:r16psfcpu_firmware
- mitsubishielectric:r16sfcpu_firmware
- mitsubishielectric:r32cpu_firmware
- mitsubishielectric:r32pcpu_firmware
- mitsubishielectric:r32psfcpu_firmware
- mitsubishielectric:r32sfcpu_firmware