What is CVE-2023-3346?

CVE-2023-3346 is a critical-severity vulnerability in Mitsubishielectric C80, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2023-08-03.

How severe is CVE-2023-3346?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Mitsubishielectric C80

CVE-2023-3346

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in MITSUBSHI CNC Series allows a remote unauthenticated attacker to cause Denial of Service (DoS) condition and execute arbitrary code on the product by sending specially crafted packets. In addition, system reset is required for recovery.

Vulnerability class: Buffer Overflow

Published 2023-08-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.021 (80.9th percentile), scored 2026-09-28.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000

Affected products

Weakness classification (CWE)

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

References

www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-007_en.pdf (vendor-advisory, Vendor Advisory)
jvn.jp/vu/JVNVU90352157/index.html (Third Party Advisory, government-resource)
www.cisa.gov/news-events/ics-advisories/icsa-23-208-03 (US Government Resource, Third Party Advisory, government-resource)

Frequently asked questions

What is CVE-2023-3346?: CVE-2023-3346 is a critical-severity vulnerability in Mitsubishielectric C80, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2023-08-03.
How severe is CVE-2023-3346?: Critical severity. CVSS v3 base score is 9.8 out of 10.