{"id":"CVE-2020-5668","url":"https://www.cyber-defence.io/tools/cve/CVE-2020-5668","generatedAt":"2026-10-27T22:33:49.644Z","title":"Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series modules (R00/01/02CPU firmware version '19' and earlier, R04/08/16/32/120 (EN) CPU firmware version '51' and earlier, R08/16/32/120SFCPU firmware version '22' and earlier,…","description":"Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series modules (R00/01/02CPU firmware version '19' and earlier, R04/08/16/32/120 (EN) CPU firmware version '51' and earlier, R08/16/32/120SFCPU firmware version '22' and earlier, R08/16/32/120PCPU firmware version '25' and earlier, R08/16/32/120PSFCPU firmware version '06' and earlier, RJ71EN71 firmware version '47' and earlier, RJ71GF11-T2 firmware version '47' and earlier, RJ72GF15-T2 firmware version '07' and earlier, RJ71GP21-SX firmware version '47' and earlier, RJ71GP21S-SX firmware version '47' and earlier, and RJ71GN11-T2 firmware version '11' and earlier) allows a remote unauthenticated attacker to cause an error in a CPU unit and cause a denial-of-service (DoS) condition in execution of the program and its communication, or to cause a denial-of-service (DoS) condition in communication via the unit by receiving a specially crafted SLMP packet","published":"2020-11-20T04:15:11.000Z","lastModified":"2026-06-17T03:22:04.000Z","status":"Modified","sourceIdentifier":"vultures@jpcert.or.jp","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["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","mitsubishielectric/rj71en71 firmware","mitsubishielectric/rj71gf11-t2 firmware","mitsubishielectric/rj72gf15-t2 firmware","mitsubishielectric/rj71gp21-sx firmware","mitsubishielectric/rj71gp21s-sx firmware","mitsubishielectric/rj71c24-r2 firmware","mitsubishielectric/rj71c24-r4 firmware","mitsubishielectric/rj71gn11-t2 firmware"],"epss":{"score":0.04935,"percentile":0.92081,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (4.93%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://jvn.jp/vu/JVNVU95980140/index.html","tags":["Third Party Advisory"],"source":"vultures@jpcert.or.jp"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-20-324-05","tags":["Third Party Advisory","US Government Resource"],"source":"vultures@jpcert.or.jp"},{"url":"https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-016.pdf","tags":["Vendor Advisory"],"source":"vultures@jpcert.or.jp"},{"url":"https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-016_en.pdf","tags":["Vendor Advisory"],"source":"vultures@jpcert.or.jp"},{"url":"https://jvn.jp/vu/JVNVU95980140/index.html","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-20-324-05","tags":["Third Party Advisory","US Government Resource"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-016.pdf","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-016_en.pdf","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2020-5668","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}