What is CVE-2023-4699?

CVE-2023-4699 is a critical-severity vulnerability in Mitsubishielectric Fx3g-14mr\/ds, classified under Missing Authentication for Critical Function. CVSS score: 10.0/10. Published 2023-11-06.

How severe is CVE-2023-4699?

Critical severity. CVSS v3 base score is 10.0 out of 10.

Is CVE-2023-4699 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Mitsubishielectric Fx3g-14mr\/ds

CVE-2023-4699

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.

Vulnerability class: Broken Authentication

Published 2023-11-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (53.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-013_en.pdf (vendor-advisory, Vendor Advisory)
jvn.jp/vu/JVNVU94620134/ (Third Party Advisory, government-resource)
www.cisa.gov/news-events/ics-advisories/icsa-23-306-03 (US Government Resource, Third Party Advisory, government-resource)

Frequently asked questions

What is CVE-2023-4699?: CVE-2023-4699 is a critical-severity vulnerability in Mitsubishielectric Fx3g-14mr\/ds, classified under Missing Authentication for Critical Function. CVSS score: 10.0/10. Published 2023-11-06.
How severe is CVE-2023-4699?: Critical severity. CVSS v3 base score is 10.0 out of 10.
Is CVE-2023-4699 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.