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Melsec Iq R R00 Cpu FirmwareOperating system · Mitsubishi

CVE-2022-33324

HIGH · 7.5 CVSS v3.1 Published 2022-12-23
Fix available
A fix is available. Upgrade to 33.0 / 66.0 or later.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Improper Resource Shutdown or Release vulnerability in Mitsubishi Electric Corporation MELSEC iQ-R Series R00/01/02CPU Firmware versions "32" and prior, Mitsubishi Electric Corporation MELSEC iQ-R Series R04/08/16/32/120(EN)CPU Firmware versions "65" and prior, Mitsubishi Electric Corporation MELSEC iQ-R Series R08/16/32/120SFCPU Firmware versions "29" and prior, Mitsubishi Electric Corporation MELSEC iQ-R Series R08/16/32/120PSFCPU Firmware versions "08" and prior, Mitsubishi Electric Corporation MELSEC iQ-R Series R12CCPU-V Firmware versions "17" and prior, Mitsubishi Electric Corporation MELSEC iQ-L Series L04/08/16/32HCPU Firmware versions "05" and prior and Mitsubishi Electric Corporation MELIPC Series MI5122-VW Firmware versions "07" and prior allows a remote unauthenticated attacker to cause a Denial of Service condition in Ethernet communication on the module by sending specially crafted packets. A system reset of the module is required for recovery.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Melsec Iq R R00 Cpu FirmwareOperating system
Affected:< 33.0
Melsec Iq R R01 Cpu FirmwareOperating system
Affected:< 33.0
Melsec Iq R R02 Cpu FirmwareOperating system
Affected:< 33.0
Melsec Iq R R04 Cpu FirmwareOperating system
Affected:< 66.0
Melsec Iq R R08 Cpu FirmwareOperating system
Affected:< 66.0
Melsec Iq R R16 Cpu FirmwareOperating system
Affected:< 66.0
Melsec Iq R R32 Cpu FirmwareOperating system
Affected:< 66.0
Melsec Iq R R120 Cpu FirmwareOperating system
Affected:< 66.0

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 33.0 / 66.0 or later
Fixed in 33.066.0
Vendor patch www.cisa.gov →
Recommended fix High confidence

R00/R01/R02 to firmware >=33.0; R04/R08/R16/R32/R120 to firmware >=66.0

  1. 1. Identify the current firmware version of the MELSEC iQ-R Series CPU module via the engineering workstation (GX Works3) or the module's front panel display.
  2. 2. Navigate to the official Mitsubishi Electric support page or the CISA advisory (icsa-22-356-03) to obtain the firmware update file.
  3. 3. For R00/01/02 CPU modules: upgrade to firmware version 33.0 or later.
  4. 4. For R04/08/16/32/120 CPU modules: upgrade to firmware version 66.0 or later.
  5. 5. Download the appropriate firmware update package for your specific CPU model.
  6. 6. Connect to the CPU module via the engineering station and initiate the firmware update process following the instructions in the Mitsubishi firmware update manual.
  7. 7. Verify the firmware version has been successfully updated after the process completes.
  8. 8. Test Ethernet communication functionality to confirm the module has recovered properly and is no longer vulnerable to the crafted packet DoS attack.
Caveat Firmware updates on industrial controllers may require revalidation of control logic and could interrupt production; ensure proper change management and backup before proceeding

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

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