CVE-2023-4699

Arbitrary Command Execution Vulnerability in Mitsubishi Electric proprietary protocol communication of multiple FA products

10.0 CriticalPublic exploit

Missing Authentication for Critical Function vulnerability in Mitsubishi Electric Corporation MELSEC-F Series CPU modules, MELSEC iQ-F Series, MELSEC iQ-R series CPU modules, MELSEC iQ-R series, MELSEC iQ-L series, MELSEC Q series, MELSEC-L series, Mitsubishi Electric CNC M800V/M80V series, Mitsubishi Electric CNC M800/M80/E80 series and Mitsubishi Electric CNC M700V/M70V/E70 series allows a remote unauthenticated attacker to execute arbitrary commands by sending specific packets to the affected products. This could lead to disclose or tamper with information by reading or writing control programs, or cause a denial-of-service (DoS) condition on the products by resetting the memory contents of the products to factory settings or resetting the products remotely.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

1.14%Up 1.1 points since Nov 6, 2023

What each source reports

CVE List Score used 10.0

Arbitrary Command Execution Vulnerability in Mitsubishi Electric proprietary protocol communication of multiple FA products

Record: CVE-2023-4699
CVSS 3.1: 10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-306
Updated: 2026-11-02

EUVDEUVD-2023-54547 10.0

Record: EUVD-2023-54547
CVSS 3.1: 10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-q8jx-8wr3-gv52 9.1

Insufficient Verification of Data Authenticity vulnerability in Mitsubishi Electric Corporation...

Insufficient Verification of Data Authenticity vulnerability in Mitsubishi Electric Corporation MELSEC-F Series main modules and MELSEC iQ-F Series CPU modules allows a remote unauthenticated attacker to reset the memory of the products to factory default state and cause denial-of-service (DoS) condition on the products by sending specific packets.

Record: GHSA-q8jx-8wr3-gv52
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Weakness: CWE-306, CWE-345
Updated: 2026-11-02

NVD 10.0

Record: CVE-2023-4699
CVSS 3.1: 10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CVSS 3.1: 9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Weakness: CWE-306, CWE-345
Updated: 2026-11-02

Affected products

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Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
Source	Link	Date
PoC in GitHub	Scottzxor/Citrix-Bleed-Buffer-Overread-Demo	2023-11-17

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2023-4699 is a critical vulnerability (CVSS 10.0) in Mitsubishi Electric Corporation Melsec Iq-f Series Fx5-40ssc-g, published November 6, 2023. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 1.14%, the 66th percentile. No source names a fixed version.