# Improper input validation in Mitsubishi Electric Corporation MELSEC iQ-R Series R00CPU and others CVE record · `CVE-2021-20611` - **Identifiers:** `CVE-2021-20611` - **State:** Confirmed - **Severity:** CVSS 7.5 High - **Critical:** No - **CNA:** Mitsubishi - **Weakness (CWE):** [CWE-20](https://cwe.mitre.org/data/definitions/20.html) - **Tags:** [CWE-20](https://agentprime.io/advisories/tag/cwe-20.md) - **Technologies:** [Mitsubishi Electric Corporation MELSEC iQ-R Series R00CPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r00cpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R01CPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r01cpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R02CPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r02cpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R04CPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r04cpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R08CPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r08cpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R16CPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r16cpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R32CPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r32cpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R120CPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r120cpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R04ENCPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r04encpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R08ENCPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r08encpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R16ENCPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r16encpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R32ENCPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r32encpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R120ENCPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r120encpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R08SFCPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r08sfcpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R16SFCPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r16sfcpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R32SFCPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r32sfcpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R120SFCPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r120sfcpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R08PCPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r08pcpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R16PCPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r16pcpu.md) · [Mitsubishi Electric Corporation MELSEC iQ-R Series R32PCPU](https://agentprime.io/advisories/technology/mitsubishi-electric-corporation-melsec-iq-r-series-r32pcpu.md) - **Published:** 1 Dec 2021 - **Updated:** 3 Aug 2024 - **Reviewed by a person:** No 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: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R00CPU. - affected: `Firmware versions "24" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R01CPU. - affected: `Firmware versions "24" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R02CPU. - affected: `Firmware versions "24" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R04CPU. - affected: `Firmware versions "57" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R08CPU. - affected: `Firmware versions "57" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R16CPU. - affected: `Firmware versions "57" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R32CPU. - affected: `Firmware versions "57" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R120CPU. - affected: `Firmware versions "57" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R04ENCPU. - affected: `Firmware versions "57" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R08ENCPU. - affected: `Firmware versions "57" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R16ENCPU. - affected: `Firmware versions "57" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R32ENCPU. - affected: `Firmware versions "57" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R120ENCPU. - affected: `Firmware versions "57" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R08SFCPU. - affected: `Firmware versions "26" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R16SFCPU. - affected: `Firmware versions "26" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R32SFCPU. - affected: `Firmware versions "26" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R120SFCPU. - affected: `Firmware versions "26" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R08PCPU. - affected: `Firmware versions "29" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R16PCPU. - affected: `Firmware versions "29" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R32PCPU. - affected: `Firmware versions "29" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R120PCPU. - affected: `Firmware versions "29" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R08PSFCPU. - affected: `Firmware versions "08" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R16PSFCPU. - affected: `Firmware versions "08" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R32PSFCPU. - affected: `Firmware versions "08" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R120PSFCPU. - affected: `Firmware versions "08" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R16MTCPU. - affected: `Operating system software version "23" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R32MTCPU. - affected: `Operating system software version "23" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R64MTCPU. - affected: `Operating system software version "23" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC iQ-R Series R12CCPU-V. - affected: `Firmware versions "16" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC Q Series Q03UDECPU. - affected: `The first 5 digits of serial No. "23121" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC Q Series Q04UDEHCPU. - affected: `The first 5 digits of serial No. "23121" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC Q Series Q06UDEHCPU. - affected: `The first 5 digits of serial No. "23121" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC Q Series Q10UDEHCPU. - affected: `The first 5 digits of serial No. "23121" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC Q Series Q13UDEHCPU. - affected: `The first 5 digits of serial No. "23121" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC Q Series Q20UDEHCPU. - affected: `The first 5 digits of serial No. "23121" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC Q Series Q26UDEHCPU. - affected: `The first 5 digits of serial No. "23121" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC Q Series Q50UDEHCPU. - affected: `The first 5 digits of serial No. "23121" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC Q Series Q100UDEHCPU. - affected: `The first 5 digits of serial No. "23121" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: MELSEC Q Series Q03UDVCPU. - affected: `The first 5 digits of serial No. "23071" and prior` - Other versions: unaffected - Vendor: Mitsubishi Electric Corporation. Product: 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: ## 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 - 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from 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 - [CVE List: CVE-2021-20611](https://www.cve.org/CVERecord?id=CVE-2021-20611) - [NVD: CVE-2021-20611](https://nvd.nist.gov/vuln/detail/CVE-2021-20611) ### References from the CNA - (vendor-advisory) - (government-resource) - (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. ## Check whether this affects you This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run. - With the agentprime MCP server (), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: - As JSON: - Everything that needs attention now: --- The web page: . Everything for agents: .