{"id":"CVE-2020-5668","aliases":["EUVD-2020-26829","GHSA-9rm6-q34g-q949"],"status":"published","title":"Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series modules (R00/01/02CPU...","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","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.04935,"percentile":0.92251,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2020-11-20T03:30:23Z","modified":"2026-06-17T03:22:04Z","products":[{"vendor":"mitsubishi electric corporation","product":"melsec iq-r"},{"vendor":"mitsubishielectric","product":"r00cpu_firmware"},{"vendor":"mitsubishielectric","product":"r01cpu_firmware"},{"vendor":"mitsubishielectric","product":"r02cpu_firmware"},{"vendor":"mitsubishielectric","product":"r04cpu_firmware"},{"vendor":"mitsubishielectric","product":"r08cpu_firmware"},{"vendor":"mitsubishielectric","product":"r08pcpu_firmware"},{"vendor":"mitsubishielectric","product":"r08psfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r08sfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r120cpu_firmware"},{"vendor":"mitsubishielectric","product":"r120pcpu_firmware"},{"vendor":"mitsubishielectric","product":"r120psfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r120sfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r16cpu_firmware"},{"vendor":"mitsubishielectric","product":"r16pcpu_firmware"},{"vendor":"mitsubishielectric","product":"r16psfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r16sfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r32cpu_firmware"},{"vendor":"mitsubishielectric","product":"r32pcpu_firmware"},{"vendor":"mitsubishielectric","product":"r32psfcpu_firmware"},{"vendor":"mitsubishielectric","product":"r32sfcpu_firmware"},{"vendor":"mitsubishielectric","product":"rj71c24-r2_firmware"},{"vendor":"mitsubishielectric","product":"rj71c24-r4_firmware"},{"vendor":"mitsubishielectric","product":"rj71en71_firmware"},{"vendor":"mitsubishielectric","product":"rj71gf11-t2_firmware"},{"vendor":"mitsubishielectric","product":"rj71gn11-t2_firmware"},{"vendor":"mitsubishielectric","product":"rj71gp21-sx_firmware"},{"vendor":"mitsubishielectric","product":"rj71gp21s-sx_firmware"},{"vendor":"mitsubishielectric","product":"rj72gf15-t2_firmware"}],"references":[{"url":"https://www.mitsubishielectric.co.jp/psirt/vulnerability/pdf/2020-016.pdf","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2020-016_en.pdf","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-20-324-05","tags":["x_refsource_MISC","x_transferred","Third Party Advisory","US Government Resource"]},{"url":"https://jvn.jp/vu/JVNVU95980140/index.html","tags":["x_refsource_MISC","x_transferred","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5668"},{"url":"https://github.com/advisories/GHSA-9rm6-q34g-q949"}],"sources":{"cve":[{"id":"CVE-2020-5668","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","status":"published","published":"2020-11-20T03:30:23Z","modified":"2024-08-04T08:39:25.511Z","updated_at":"2026-11-02T14:35:47.22408Z"}],"euvd":[{"id":"EUVD-2020-26829","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","status":"published","published":"2020-11-20T03:30:23Z","modified":"2024-08-04T08:39:25Z","updated_at":"2026-11-03T03:08:06.272693Z"}],"ghsa":[{"id":"GHSA-9rm6-q34g-q949","title":"Uncontrolled resource consumption vulnerability in MELSEC iQ-R Series modules (R00/01/02CPU...","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 all versions, R08/16/32/120PSFCPU all versions, 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, RJ71C24 (-R2/R4) all versions, and RJ71GN11-T2 all versions) 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 module by a specially crafted SLMP packet","status":"published","published":"2022-05-24T17:34:41Z","modified":"2023-01-29T05:05:25Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:45:47.324105Z"}],"nvd":[{"id":"CVE-2020-5668","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","status":"published","published":"2020-11-20T04:15:11.423Z","modified":"2026-06-17T03:22:04.08Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":7.8,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-400"],"updated_at":"2026-11-02T14:06:25.394006Z"}]}}