CVE-2022-40265Network attack vector

Reset-required denial of service via crafted packets

Published Nov 30, 2022 · Updated Apr 24, 2025

Improper input validation in MELSEC iQ-R Ethernet firmware 65 and earlier allows remote attackers to cause a reset-required service outage. The network-processing path accepts specially crafted packets without adequate validation, but Mitsubishi Electric has not disclosed the affected protocol, message field, or failing operation. No authentication or user interaction is required; successful exploitation halts service until the affected module or CPU is reset.

CVSS severity8.6
High
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in MELSEC iQ-R Ethernet firmware 65 and earlier allows remote attackers to cause a reset-required service outage. The network-processing path accepts specially crafted packets without adequate validation, but Mitsubishi Electric has not disclosed the affected protocol, message field, or failing operation. No authentication or user interaction is required; successful exploitation halts service until the affected module or CPU is reset.

The record

CVE
CVE-2022-40265
Published
Nov 30, 2022
Updated
Apr 24, 2025
Vendor
Mitsubishi Electric Corporation
Product
MELSEC iQ-R Series RJ71EN71
Classifications
CWE-20, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 30, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Firmware version "65" and prior

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mitsubishi Electric Corporation · MELSEC iQ-R Series RJ71EN71version=Firmware version "65" and prior
Mitsubishi Electric Corporation · MELSEC iQ-R Series R04/08/16/32/120ENCPUversion=Network Part Firmware version "65" and prior

Published CVSS scores

8.6Mitsubishi Electric CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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