CVE-2020-5666
Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series CPU Modules (R00/01/02CPU Firmware versions from '05' to '19' and R04/08/16/32/120(EN)CPU Firmware versions from '35' to '51') allows a remote attacker to cause an error in a CPU unit…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (8.75%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series CPU Modules (R00/01/02CPU Firmware versions from '05' to '19' and R04/08/16/32/120(EN)CPU Firmware versions from '35' to '51') allows a remote attacker to cause an error in a CPU unit via a specially crafted HTTP packet, which may lead to a denial-of-service (DoS) condition in execution of the program and its communication.
- 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
- 8.75% probability · 95th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- mitsubishielectric/melsec iq-r00 firmware · mitsubishielectric/melsec iq-r01 firmware · mitsubishielectric/melsec iq-r02 firmware · mitsubishielectric/melsec iq-r04 firmware · mitsubishielectric/melsec iq-r16 firmware · mitsubishielectric/melsec iq-r08 firmware · mitsubishielectric/melsec iq-r32 firmware · mitsubishielectric/melsec iq-r120 firmware
- Source
- vultures@jpcert.or.jp
EPSS 8.8% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://jvn.jp/en/jp/JVN44764844/index.htmlThird Party Advisory
- https://jvn.jp/jp/JVN44764844/index.htmlThird Party Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-20-317-01Third Party Advisory, US Government Resource
- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-015_en.pdfMitigation, Vendor Advisory
- https://jvn.jp/en/jp/JVN44764844/index.htmlThird Party Advisory
- https://jvn.jp/jp/JVN44764844/index.htmlThird Party Advisory
- https://us-cert.cisa.gov/ics/advisories/icsa-20-317-01Third Party Advisory, US Government Resource
- https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-015_en.pdfMitigation, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.