Details of VAR-202112-0208

ID

VAR-202112-0208

CVE

CVE-2021-20611

TITLE

MELSEC and MELIPC Input verification vulnerabilities in the series

Trust: 0.8

sources: JVNDB: JVNDB-2021-005285

DESCRIPTION

Improper Input Validation vulnerability in Mitsubishi Electric MELSEC iQ-R Series R00/01/02CPU, MELSEC iQ-R Series R04/08/16/32/120(EN)CPU, MELSEC iQ-R Series R08/16/32/120SFCPU, MELSEC iQ-R Series R08/16/32/120PCPU, MELSEC iQ-R Series R08/16/32/120PSFCPU, MELSEC iQ-R Series R16/32/64MTCPU, MELSEC iQ-R Series R12CCPU-V, MELSEC Q Series Q03UDECPU, MELSEC Q Series Q04/06/10/13/20/26/50/100UDEHCPU, MELSEC Q Series Q03/04/06/13/26UDVCPU, MELSEC Q Series Q04/06/13/26UDPVCPU, MELSEC Q Series Q12DCCPU-V, MELSEC Q Series Q24DHCCPU-V(G), MELSEC Q Series Q24/26DHCCPU-LS, MELSEC Q Series MR-MQ100, MELSEC Q Series Q172/173DCPU-S1, MELSEC Q Series Q172/173DSCPU, MELSEC Q Series Q170MCPU, MELSEC Q Series Q170MSCPU(-S1), MELSEC L Series L02/06/26CPU(-P), MELSEC L Series L26CPU-(P)BT and MELIPC Series MI5122-VW allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition by sending specially crafted packets. System reset is required for recovery. MELSEC and MELIPC There is an input verification vulnerability in the series.Denial of service (DoS) It may be put into a state

Trust: 1.62

sources: NVD: CVE-2021-20611 // JVNDB: JVNDB-2021-005285

AFFECTED PRODUCTS

vendor:	mitsubishi	model:	melsec q100udecpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r32 mtcpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q04udecpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q03udecpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q04udvcpu	scope:	eq	version:	-	Trust: 1.0
vendor:	mitsubishi	model:	melsec q24dhccpu-v\	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r32 pcpu	scope:	lte	version:	29	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r04 cpu	scope:	lte	version:	57	Trust: 1.0
vendor:	mitsubishi	model:	melsec q26dhccpu-ls	scope:	eq	version:	-	Trust: 1.0
vendor:	mitsubishi	model:	melsec mr-mq100	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r120 pcpu	scope:	lte	version:	29	Trust: 1.0
vendor:	mitsubishi	model:	melsec q13udvcpu	scope:	eq	version:	-	Trust: 1.0
vendor:	mitsubishi	model:	melsec q13udecpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q173dscpu	scope:	eq	version:	-	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r12 ccpu-v	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec l02cpu\	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q26udpvcpu	scope:	eq	version:	-	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r08 cpu	scope:	lte	version:	57	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r120 cpu	scope:	lte	version:	57	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r32 cpu	scope:	lte	version:	57	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r16 pcpu	scope:	lte	version:	29	Trust: 1.0
vendor:	mitsubishi	model:	melsec q173dcpu-s1	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q26udvcpu	scope:	eq	version:	-	Trust: 1.0
vendor:	mitsubishi	model:	melsec q172dscpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q13udpvcpu	scope:	eq	version:	-	Trust: 1.0
vendor:	mitsubishi	model:	melsec l26cpu\	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r16 cpu	scope:	lte	version:	57	Trust: 1.0
vendor:	mitsubishi	model:	melsec q10udecpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q26udecpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q04udpvcpu	scope:	eq	version:	-	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r120 cpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q170mcpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r32 cpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r16 mtcpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec l06cpu\	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q03udvcpu	scope:	eq	version:	-	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r16 cpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r08 pcpu	scope:	lte	version:	29	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r32 sfcpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q20udecpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melipc mi5122-vw	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q06udecpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r02 cpu	scope:	lte	version:	24	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r08 sfcpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q50udecpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q24dhccpu-ls	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q172dcpu-s1	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec l26cpu-\ bt	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r00 cpu	scope:	lte	version:	24	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r16 sfcpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r120 sfcpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q170mscpu\	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec q12dccpu-v	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r01 cpu	scope:	lte	version:	24	Trust: 1.0
vendor:	mitsubishi	model:	melsec q06udpvcpu	scope:	eq	version:	-	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r04 pcpu	scope:	lte	version:	29	Trust: 1.0
vendor:	mitsubishi	model:	melsec q06udvcpu	scope:	eq	version:	-	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r64 mtcpu	scope:	eq	version:	*	Trust: 1.0
vendor:	mitsubishi	model:	melsec iq-r r08 cpu	scope:	eq	version:	*	Trust: 1.0
vendor:	三菱電機	model:	melsec iq-r r02cpu	scope:	-	version:	-	Trust: 0.8
vendor:	三菱電機	model:	melsec iq-r r32cpu	scope:	-	version:	-	Trust: 0.8
vendor:	三菱電機	model:	melsec iq-r r00cpu	scope:	-	version:	-	Trust: 0.8
vendor:	三菱電機	model:	melsec iq-r r01cpu	scope:	-	version:	-	Trust: 0.8
vendor:	三菱電機	model:	melsec iq-r r120cpu	scope:	-	version:	-	Trust: 0.8
vendor:	三菱電機	model:	melsec iq-r r04cpu	scope:	-	version:	-	Trust: 0.8
vendor:	三菱電機	model:	melsec iq-r r16pcpu	scope:	-	version:	-	Trust: 0.8
vendor:	三菱電機	model:	melsec iq-r r16cpu	scope:	-	version:	-	Trust: 0.8
vendor:	三菱電機	model:	melsec iq-r r08pcpu	scope:	-	version:	-	Trust: 0.8
vendor:	三菱電機	model:	melsec iq-r r08cpu	scope:	-	version:	-	Trust: 0.8

sources: JVNDB: JVNDB-2021-005285 // NVD: CVE-2021-20611

CVSS

SEVERITY

CVSSV2

CVSSV3

nvd@nist.gov:	CVE-2021-20611
value:	HIGH
Trust: 1.0
Mitsubishielectric.Psirt@yd.MitsubishiElectric.co.jp:	CVE-2021-20611
value:	HIGH
Trust: 1.0
NVD:	CVE-2021-20611
value:	HIGH
Trust: 0.8
CNNVD:	CNNVD-202111-2341
value:	HIGH
Trust: 0.6

nvd@nist.gov:	CVE-2021-20611
severity:	HIGH
baseScore:	7.8
vectorString:	AV:N/AC:L/AU:N/C:N/I:N/A:C
accessVector:	NETWORK
accessComplexity:	LOW
authentication:	NONE
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	COMPLETE
exploitabilityScore:	10.0
impactScore:	6.9
acInsufInfo:	NONE
obtainAllPrivilege:	NONE
obtainUserPrivilege:	NONE
obtainOtherPrivilege:	NONE
userInteractionRequired:	NONE
version:	2.0
Trust: 1.8

nvd@nist.gov:	CVE-2021-20611
baseSeverity:	HIGH
baseScore:	7.5
vectorString:	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
attackVector:	NETWORK
attackComplexity:	LOW
privilegesRequired:	NONE
userInteraction:	NONE
scope:	UNCHANGED
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	HIGH
exploitabilityScore:	3.9
impactScore:	3.6
version:	3.1
Trust: 2.0
NVD:	CVE-2021-20611
baseSeverity:	HIGH
baseScore:	7.5
vectorString:	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
attackVector:	NETWORK
attackComplexity:	LOW
privilegesRequired:	NONE
userInteraction:	NONE
scope:	UNCHANGED
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	HIGH
exploitabilityScore:	NONE
impactScore:	NONE
version:	3.0
Trust: 0.8

sources: CNNVD: CNNVD-202111-2341 // JVNDB: JVNDB-2021-005285 // NVD: CVE-2021-20611 // NVD: CVE-2021-20611

PROBLEMTYPE DATA

problemtype:	CWE-20	Trust: 1.0
problemtype:	Incorrect input confirmation (CWE-20) [NVD Evaluation ]	Trust: 0.8

sources: JVNDB: JVNDB-2021-005285 // NVD: CVE-2021-20611

THREAT TYPE

remote

Trust: 0.6

sources: CNNVD: CNNVD-202111-2341

TYPE

input validation error

Trust: 0.6

sources: CNNVD: CNNVD-202111-2341

PATCH

title:	Multiple Denial-of-Service Vulnerabilities in Ethernet port of MELSEC and MELIPC Series Mitsubishi Electric Corporation	url:	https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-019_en.pdf	Trust: 0.8
title:	Mitsubishi Electric Repair measures for multiple product input verification errors	url:	http://123.124.177.30/web/xxk/bdxqById.tag?id=172522	Trust: 0.6

sources: CNNVD: CNNVD-202111-2341 // JVNDB: JVNDB-2021-005285

EXTERNAL IDS

db:	NVD	id:	CVE-2021-20611	Trust: 3.2
db:	ICS CERT	id:	ICSA-21-334-02	Trust: 2.4
db:	JVN	id:	JVNVU94434051	Trust: 2.4
db:	JVNDB	id:	JVNDB-2021-005285	Trust: 0.8
db:	AUSCERT	id:	ESB-2021.4034	Trust: 0.6
db:	CS-HELP	id:	SB2021120105	Trust: 0.6
db:	CNNVD	id:	CNNVD-202111-2341	Trust: 0.6

sources: CNNVD: CNNVD-202111-2341 // JVNDB: JVNDB-2021-005285 // NVD: CVE-2021-20611

REFERENCES

url:	https://jvn.jp/vu/jvnvu94434051/index.html	Trust: 2.4
url:	https://us-cert.cisa.gov/ics/advisories/icsa-21-334-02	Trust: 2.2
url:	https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-019_en.pdf	Trust: 1.6
url:	https://nvd.nist.gov/vuln/detail/cve-2021-20611	Trust: 1.4
url:	https://www.cisa.gov/uscert/ics/advisories/icsa-21-334-02	Trust: 0.8
url:	https://www.auscert.org.au/bulletins/esb-2021.4034	Trust: 0.6
url:	https://www.cybersecurity-help.cz/vdb/sb2021120105	Trust: 0.6

sources: CNNVD: CNNVD-202111-2341 // JVNDB: JVNDB-2021-005285 // NVD: CVE-2021-20611

CREDITS

Mitsubishi Electric reported these vulnerabilities to CISA.

Trust: 0.6

sources: CNNVD: CNNVD-202111-2341

SOURCES

db:	CNNVD	id:	CNNVD-202111-2341
db:	JVNDB	id:	JVNDB-2021-005285
db:	NVD	id:	CVE-2021-20611

LAST UPDATE DATE

2026-06-19T22:49:16.994000+00:00

SOURCES UPDATE DATE

db:	CNNVD	id:	CNNVD-202111-2341	date:	2022-11-28T00:00:00
db:	JVNDB	id:	JVNDB-2021-005285	date:	2021-12-10T05:10:00
db:	NVD	id:	CVE-2021-20611	date:	2026-06-17T03:34:07.167

SOURCES RELEASE DATE

db:	CNNVD	id:	CNNVD-202111-2341	date:	2021-11-30T00:00:00
db:	JVNDB	id:	JVNDB-2021-005285	date:	2021-12-10T00:00:00
db:	NVD	id:	CVE-2021-20611	date:	2021-12-01T16:15:07.550