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CVE-2021-20611

HIGH
Published 2021-12-01T15:41:31
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CVSS Score

V3.1
7.5
/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.005
probability
of exploitation in the wild

There is a 0.5% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.633
Higher than 63.3% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
NONE
Availability
HIGH

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Mitsubishi Electric Corporation

MELSEC iQ-R Series R00CPU

Affected Versions:

Firmware versions "24" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R01CPU

Affected Versions:

Firmware versions "24" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R02CPU

Affected Versions:

Firmware versions "24" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R04CPU

Affected Versions:

Firmware versions "57" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R08CPU

Affected Versions:

Firmware versions "57" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R16CPU

Affected Versions:

Firmware versions "57" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R32CPU

Affected Versions:

Firmware versions "57" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R120CPU

Affected Versions:

Firmware versions "57" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R04ENCPU

Affected Versions:

Firmware versions "57" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R08ENCPU

Affected Versions:

Firmware versions "57" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R16ENCPU

Affected Versions:

Firmware versions "57" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R32ENCPU

Affected Versions:

Firmware versions "57" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R120ENCPU

Affected Versions:

Firmware versions "57" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R08SFCPU

Affected Versions:

Firmware versions "26" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R16SFCPU

Affected Versions:

Firmware versions "26" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R32SFCPU

Affected Versions:

Firmware versions "26" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R120SFCPU

Affected Versions:

Firmware versions "26" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R08PCPU

Affected Versions:

Firmware versions "29" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R16PCPU

Affected Versions:

Firmware versions "29" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R32PCPU

Affected Versions:

Firmware versions "29" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R120PCPU

Affected Versions:

Firmware versions "29" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R08PSFCPU

Affected Versions:

Firmware versions "08" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R16PSFCPU

Affected Versions:

Firmware versions "08" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R32PSFCPU

Affected Versions:

Firmware versions "08" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R120PSFCPU

Affected Versions:

Firmware versions "08" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R16MTCPU

Affected Versions:

Operating system software version "23" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R32MTCPU

Affected Versions:

Operating system software version "23" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R64MTCPU

Affected Versions:

Operating system software version "23" and prior
Mitsubishi Electric Corporation

MELSEC iQ-R Series R12CCPU-V

Affected Versions:

Firmware versions "16" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q03UDECPU

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q04UDEHCPU

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q06UDEHCPU

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q10UDEHCPU

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q13UDEHCPU

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q20UDEHCPU

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q26UDEHCPU

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q50UDEHCPU

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q100UDEHCPU

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q03UDVCPU

Affected Versions:

The first 5 digits of serial No. "23071" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q04UDVCPU

Affected Versions:

The first 5 digits of serial No. "23071" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q06UDVCPU

Affected Versions:

The first 5 digits of serial No. "23071" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q13UDVCPU

Affected Versions:

The first 5 digits of serial No. "23071" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q26UDVCPU

Affected Versions:

The first 5 digits of serial No. "23071" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q04UDPVCPU

Affected Versions:

The first 5 digits of serial No. "23071" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q06UDPVCPU

Affected Versions:

The first 5 digits of serial No. "23071" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q13UDPVCPU

Affected Versions:

The first 5 digits of serial No. "23071" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q26UDPVCPU

Affected Versions:

The first 5 digits of serial No. "23071" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q12DCCPU-V

Affected Versions:

The first 5 digits of serial No. "24031" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q24DHCCPU-V

Affected Versions:

The first 5 digits of serial No. "24031" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q24DHCCPU-VG

Affected Versions:

The first 5 digits of serial No. "24031" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q24DHCCPU-LS

Affected Versions:

The first 5 digits of serial No. "24031" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q26DHCCPU-LS

Affected Versions:

The first 5 digits of serial No. "24031" and prior
Mitsubishi Electric Corporation

MELSEC Q Series MR-MQ100

Affected Versions:

Operating system software version "F" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q172DCPU-S1

Affected Versions:

Operating system software version "W" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q173DCPU-S1

Affected Versions:

Operating system software version "W" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q172DSCPU

Affected Versions:

Operating system software version "Y" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q173DSCPU

Affected Versions:

Operating system software version "Y" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q170MCPU

Affected Versions:

Operating system software version "W" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q170MSCPU

Affected Versions:

Operating system software version "Y" and prior
Mitsubishi Electric Corporation

MELSEC Q Series Q170MSCPU-S1

Affected Versions:

Operating system software version "Y" and prior
Mitsubishi Electric Corporation

MELSEC L Series L02CPU

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC L Series L06CPU

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC L Series L26CPU

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC L Series L02CPU-P

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC L Series L06CPU-P

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC L Series L26CPU-P

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC L Series L26CPU-BT

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELSEC L Series L26CPU-PBT

Affected Versions:

The first 5 digits of serial No. "23121" and prior
Mitsubishi Electric Corporation

MELIPC Series MI5122-VW

Affected Versions:

Firmware versions "05" and prior

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed HIGH

GHSA-pmj6-jq7v-c2r6

Advisory Details

Improper Input Validation vulnerability in MELSEC iQ-R Series R00/01/02CPU Firmware versions "24" and prior, MELSEC iQ-R Series R04/08/16/32/120(EN)CPU Firmware versions "57" and prior, MELSEC iQ-R Series R08/16/32/120SFCPU All versions, MELSEC iQ-R Series R08/16/32/120PCPU Firmware versions "29" and prior, MELSEC iQ-R Series R08/16/32/120PSFCPU All versions, MELSEC iQ-R Series R16/32/64MTCPU All versions, MELSEC iQ-R Series R12CCPU-V All versions, MELSEC Q Series Q03UDECPU All versions, MELSEC Q Series Q04/06/10/13/20/26/50/100UDEHCPU All versions, MELSEC Q Series Q03/04/06/13/26UDVCPU The first 5 digits of serial No. "23071" and prior, MELSEC Q Series Q04/06/13/26UDPVCPU The first 5 digits of serial No. "23071" and prior, MELSEC Q Series Q12DCCPU-V All versions, MELSEC Q Series Q24DHCCPU-V(G) All versions, MELSEC Q Series Q24/26DHCCPU-LS All versions, MELSEC Q Series MR-MQ100 All versions, MELSEC Q Series Q172/173DCPU-S1 All versions, MELSEC Q Series Q172/172DSCPU All versions, MELSEC Q Series Q170MCPU All versions, MELSEC Q Series Q170MSCPU(-S1) All versions, MELSEC L Series L02/06/26CPU(-P) All versions, MELSEC L Series L26CPU-(P)BT All versions and MELIPC Series MI5122-VW All versions allows a remote unauthenticated attacker to cause a denial-of-service (DoS) condition by sending specially crafted packets. System reset is required for recovery.

CVSS Scoring

CVSS Score

7.5

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2021-20611
WEB https://jvn.jp/vu/JVNVU94434051/index.html
WEB https://us-cert.cisa.gov/ics/advisories/icsa-21-334-02
WEB https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-019_en.pdf

Advisory provided by GitHub Security Advisory Database. Published: December 2, 2021, Modified: April 27, 2022

References

https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2021-019_en.pdf
https://jvn.jp/vu/JVNVU94434051/index.html
https://us-cert.cisa.gov/ics/advisories/icsa-21-334-02
Published: 2021-12-01T15:41:31
Last Modified: 2024-08-03T17:45:44.828Z
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