CVE-2024-0803Network attack vector

Unauthenticated code execution via packet integer overflow

Published Mar 14, 2024 · Updated Aug 27, 2024

Integer overflow in Mitsubishi Electric MELSEC-Q and MELSEC-L CPU modules allows remote attackers to execute code via a crafted packet. A packet-processing integer wraps, but Mitsubishi Electric has not disclosed the affected function, packet field, calculation, or resulting memory operation. Network access to the controller is sufficient; successful exploitation runs attacker-chosen code on the PLC CPU.

CVSS severity9.8
Critical
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Mitsubishi Electric MELSEC-Q and MELSEC-L CPU modules allows remote attackers to execute code via a crafted packet. A packet-processing integer wraps, but Mitsubishi Electric has not disclosed the affected function, packet field, calculation, or resulting memory operation. Network access to the controller is sufficient; successful exploitation runs attacker-chosen code on the PLC CPU.

The record

CVE
CVE-2024-0803
Published
Mar 14, 2024
Updated
Aug 27, 2024
Vendor
Mitsubishi Electric Corporation
Product
MELSEC-L L26CPU-PBT
Classifications
CWE-190, T0866
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 14, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <xxxxx26041

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mitsubishi Electric Corporation · MELSEC-L L26CPU-PBTversion=0 <xxxxx26041
Mitsubishi Electric Corporation · MELSEC-Q Series Q04UDPVCPUversion=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-L Series L02CPUversion=The first 5 digits of serial No. "26041" and prior
Mitsubishi Electric Corporation · MELSEC-L Series L26CPU-PBTversion=The first 5 digits of serial No. "26041" and prior
Mitsubishi Electric Corporation · MELSEC-Q Q10UDEHCPUversion=0 <xxxxx26061
Mitsubishi Electric Corporation · MELSEC-Q Series Q50UDEHCPUversion=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-Q Q50UDEHCPUversion=0 <xxxxx26061
Mitsubishi Electric Corporation · MELSEC-Q Series Q06UDEHCPUversion=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-Q Q06UDEHCPUversion=0 <xxxxx26061
Mitsubishi Electric Corporation · MELSEC-Q Series Q10UDEHCPUversion=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-L Series L26CPUversion=The first 5 digits of serial No. "26041" and prior
Mitsubishi Electric Corporation · MELSEC-Q Q100UDEHCPUversion=0 <xxxxx26061
Mitsubishi Electric Corporation · MELSEC-L L26CPU-BTversion=0 <xxxxx26041
Mitsubishi Electric Corporation · MELSEC-L Series L02CPU-Pversion=The first 5 digits of serial No. "26041" and prior
Mitsubishi Electric Corporation · MELSEC-Q Series Q26UDVCPUversion=0 <xxxxx26061; version=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-Q Series Q13UDVCPUversion=0 <xxxxx26061; version=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-L L06CPU-Pversion=0 <xxxxx26041
Mitsubishi Electric Corporation · MELSEC-Q Series Q06UDVCPUversion=0 <xxxxx26061; version=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-Q Series Q13UDEHCPUversion=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-Q Series Q04UDEHCPUversion=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-Q Q20UDEHCPUversion=0 <xxxxx26061
Mitsubishi Electric Corporation · MELSEC-Q Q04UDEHCPUversion=0 <xxxxx26061
Mitsubishi Electric Corporation · MELSEC-Q Series Q03UDVCPUversion=0 <xxxxx26061; version=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-Q Series Q13UDPVCPUversion=0 <xxxxx26061; version=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-L Series L26CPU-Pversion=0 <xxxxx26041; version=The first 5 digits of serial No. "26041" and prior
Mitsubishi Electric Corporation · MELSEC-Q Series Q03UDECPUversion=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-Q Q03UDECPUversion=0 <xxxxx26061
Mitsubishi Electric Corporation · MELSEC-L Series L06CPUversion=The first 5 digits of serial No. "26041" and prior
Mitsubishi Electric Corporation · MELSEC-L Series L26CPU-BTversion=The first 5 digits of serial No. "26041" and prior
Mitsubishi Electric Corporation · MELSEC-Q Series Q04UDVCPUversion=0 <xxxxx26061; version=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-L Series L06CPU-Pversion=0 <xxxxx26041; version=The first 5 digits of serial No. "26041" and prior
Mitsubishi Electric Corporation · MELSEC-Q Series Q06UDPVCPUversion=0 <xxxxx26061; version=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-Q Series Q20UDEHCPUversion=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-Q Series Q26UDPVCPUversion=0 <xxxxx26061; version=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-Q Series Q100UDEHCPUversion=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-Q Series Q26UDEHCPUversion=The first 5 digits of serial No. "26061" and prior
Mitsubishi Electric Corporation · MELSEC-Q Q26UDEHCPUversion=0 <xxxxx26061
Mitsubishi Electric Corporation · MELSEC-L L02CPU-Pversion=0 <xxxxx26041
Mitsubishi Electric Corporation · MELSEC-Q Q13UDEHCPUversion=0 <xxxxx26061
Mitsubishi Electric Corporation · MELSEC-L L26CPU-Pversion=0 <xxxxx26041

Published CVSS scores

9.8Mitsubishi Electric CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-190Integer Overflow or Wraparound
T0866Exploitation of Remote Services

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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