What is CVE-2023-1424?

CVE-2023-1424 is a critical-severity vulnerability in Mitsubishielectric Melsec Iq-Fx5u-32mr\/ds, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 10.0/10. Published 2023-05-24.

How severe is CVE-2023-1424?

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

Is CVE-2023-1424 known to be exploited?

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

Buffer overflow in Mitsubishielectric Melsec Iq-Fx5u-32mr\/ds

CVE-2023-1424

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.

Vulnerability class: Buffer Overflow

Published 2023-05-24 · 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: 0.034 (88.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 88.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.034 · newest: 0.034 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-003_en.pdf (Patch, Vendor Advisory)
jvn.jp/vu/JVNVU94650413 (Third Party Advisory)
www.cisa.gov/news-events/ics-advisories/icsa-23-143-03 (US Government Resource, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2023-1424?: CVE-2023-1424 is a critical-severity vulnerability in Mitsubishielectric Melsec Iq-Fx5u-32mr\/ds, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 10.0/10. Published 2023-05-24.
How severe is CVE-2023-1424?: Critical severity. CVSS v3 base score is 10.0 out of 10.
Is CVE-2023-1424 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.