CVE-2021-20591
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.50%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.50% probability · 73th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- mitsubishielectric/r00cpu firmware · mitsubishielectric/r01cpu firmware · mitsubishielectric/r02cpu firmware · mitsubishielectric/r04cpu firmware · mitsubishielectric/r08cpu firmware · mitsubishielectric/r16cpu firmware · mitsubishielectric/r32cpu firmware · mitsubishielectric/r120cpu firmware · mitsubishielectric/r08sfcpu firmware · mitsubishielectric/r16sfcpu firmware · mitsubishielectric/r32sfcpu firmware · mitsubishielectric/r120sfcpu firmware · mitsubishielectric/r08pcpu firmware · mitsubishielectric/r16pcpu firmware · mitsubishielectric/r32pcpu firmware · mitsubishielectric/r120pcpu firmware · mitsubishielectric/r08psfcpu firmware · mitsubishielectric/r16psfcpu firmware · mitsubishielectric/r32psfcpu firmware · mitsubishielectric/r120psfcpu firmware
- Source
- Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp
References
- https://jvn.jp/vu/JVNVU98060539/index.htmlThird Party Advisory
- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-003_en.pdfVendor Advisory
- https://jvn.jp/vu/JVNVU98060539/index.htmlThird Party Advisory
- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-003_en.pdfVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.