CVE record · CVE-2021-20611

Improper input validation in Mitsubishi Electric Corporation MELSEC iQ-R Series R00CPU and others

CVSS 7.5 HighEPSS 0.032 · 88th percentile

Published by the CVE Program (CNA: Mitsubishi) at 1 Dec 2021, 15:41 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Mitsubishi Electric Corporation	MELSEC iQ-R Series R00CPU	affected Firmware versions "24" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R01CPU	affected Firmware versions "24" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R02CPU	affected Firmware versions "24" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R04CPU	affected Firmware versions "57" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R08CPU	affected Firmware versions "57" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R16CPU	affected Firmware versions "57" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R32CPU	affected Firmware versions "57" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R120CPU	affected Firmware versions "57" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R04ENCPU	affected Firmware versions "57" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R08ENCPU	affected Firmware versions "57" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R16ENCPU	affected Firmware versions "57" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R32ENCPU	affected Firmware versions "57" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R120ENCPU	affected Firmware versions "57" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R08SFCPU	affected Firmware versions "26" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R16SFCPU	affected Firmware versions "26" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R32SFCPU	affected Firmware versions "26" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R120SFCPU	affected Firmware versions "26" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R08PCPU	affected Firmware versions "29" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R16PCPU	affected Firmware versions "29" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R32PCPU	affected Firmware versions "29" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R120PCPU	affected Firmware versions "29" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R08PSFCPU	affected Firmware versions "08" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R16PSFCPU	affected Firmware versions "08" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R32PSFCPU	affected Firmware versions "08" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R120PSFCPU	affected Firmware versions "08" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R16MTCPU	affected Operating system software version "23" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R32MTCPU	affected Operating system software version "23" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R64MTCPU	affected Operating system software version "23" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC iQ-R Series R12CCPU-V	affected Firmware versions "16" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC Q Series Q03UDECPU	affected The first 5 digits of serial No. "23121" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC Q Series Q04UDEHCPU	affected The first 5 digits of serial No. "23121" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC Q Series Q06UDEHCPU	affected The first 5 digits of serial No. "23121" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC Q Series Q10UDEHCPU	affected The first 5 digits of serial No. "23121" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC Q Series Q13UDEHCPU	affected The first 5 digits of serial No. "23121" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC Q Series Q20UDEHCPU	affected The first 5 digits of serial No. "23121" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC Q Series Q26UDEHCPU	affected The first 5 digits of serial No. "23121" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC Q Series Q50UDEHCPU	affected The first 5 digits of serial No. "23121" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC Q Series Q100UDEHCPU	affected The first 5 digits of serial No. "23121" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC Q Series Q03UDVCPU	affected The first 5 digits of serial No. "23071" and prior Other versions: unaffected
Mitsubishi Electric Corporation	MELSEC Q Series Q04UDVCPU	affected The first 5 digits of serial No. "23071" and prior Other versions: unaffected

And 29 more products. The full list is on the CVE record.

Identifiers: CVE-2021-20611
CNA: Mitsubishi
Weakness (CWE): CWE-20
Tags: Mitsubishi Electric Corporation MELSEC iQ-R Series R00CPU
Mitsubishi Electric Corporation MELSEC iQ-R Series R01CPU
Mitsubishi Electric Corporation MELSEC iQ-R Series R02CPU
Mitsubishi Electric Corporation MELSEC iQ-R Series R04CPU
Mitsubishi Electric Corporation MELSEC iQ-R Series R08CPU
Mitsubishi Electric Corporation MELSEC iQ-R Series R16CPU
Mitsubishi Electric Corporation MELSEC iQ-R Series R32CPU
Mitsubishi Electric Corporation MELSEC iQ-R Series R120CPU
CWE-20
Published: 1 Dec 2021
Updated: 3 Aug 2024

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (Mitsubishi)

CISA KEV Not listed.
EPSS 0.032, the 88th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 1 Dec 2021. New records show when each source confirmed them.

Sources

References from the CNA

www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-019_en.pdf vendor-advisory
jvn.jp/vu/JVNVU94434051/index.html government-resource
us-cert.cisa.gov/ics/advisories/icsa-21-334-02 government-resource

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.