CVE-2023-1424

Denial-of-Service and Remote Code Execution Vulnerability in MELSEC Series CPU module

HIGH
8.1
CVSS Score
Published: May 24, 2023 at 04:39 AM UTC
Updated: June 17, 2026 at 05:27 AM UTC
126 products affected across 1 vendorMELSEC Iq FX5UC 32MR /ds FirmwareMELSEC Iq FX5U 80MT /ess FirmwareMELSEC Iq FX5UC 96MT /ds Firmware

Using MELSEC iQ-F Series FX5U-32MT/ES by Mitsubishi Electric Corporation?

Get instant alerts when new vulnerabilities affect MELSEC iQ-F Series FX5U-32MT/ES - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Severity
HIGH8.1
Exploit prediction
EPSS 3%
SSVC
No known exploit

Description

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in Mitsubishi Electric Corporation MELSEC iQ-F Series CPU modules and MELSEC iQ-R Series CPU modules allows a remote unauthenticated attacker to cause a denial of service (DoS) condition or execute malicious code on a target product by sending specially crafted packets. A system reset of the product is required for recovery from a denial of service (DoS) condition and malicious code execution.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
mitsubishielectric-melsec-iq-fx5u-32mr-ds (same device)
All versions
mitsubishielectric-melsec-iq-fx5u-32mr-dss (same device)
All versions
mitsubishielectric-melsec-iq-fx5u-32mr-es (same device)
All versions
mitsubishielectric-melsec-iq-fx5u-32mr-ess (same device)
All versions
mitsubishielectric-melsec-iq-fx5u-32mt-ds (same device)
All versions
mitsubishielectric-melsec-iq-fx5u-32mt-dss (same device)
All versions
mitsubishielectric-melsec-iq-fx5u-32mt-es (same device)
All versions
mitsubishielectric-melsec-iq-fx5u-32mt-ess (same device)
All versions
mitsubishielectric-melsec-iq-fx5u-64mr-ds (same device)
All versions
mitsubishielectric-melsec-iq-fx5u-64mr-dss (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-120

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Free plan, no card