HOMEVULNERABILITIESCVE-2023-3346
CRITICAL

CVE-2023-3346

CWE-120Published: August 3, 2023· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2023-3346 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

mitsubishielectric42 product(s)
c80 firmwarec80e70 firmwaree70e80 firmwaree80m70v firmwarem70vm720vs firmwarem720vsm720vs 15-type firmwarem720vs 15-type+30
Source: NVD CPE · 42 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://jvn.jp/vu/JVNVU90352157/index.html
ADVISORYhttps://www.cisa.gov/news-events/ics-advisories/icsa-23-208-03
ADVISORYhttps://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-007_en.pdf
ADVISORYhttps://jvn.jp/vu/JVNVU90352157/index.html
ADVISORYhttps://www.cisa.gov/news-events/ics-advisories/icsa-23-208-03
ADVISORYhttps://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-007_en.pdf

All References (6)

→
https://jvn.jp/vu/JVNVU90352157/index.htmlThird Party Advisory
→
https://www.cisa.gov/news-events/ics-advisories/icsa-23-208-03Third Party Advisory · US Government Resource
→
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-007_en.pdfVendor Advisory
→
https://jvn.jp/vu/JVNVU90352157/index.htmlThird Party Advisory
→
https://www.cisa.gov/news-events/ics-advisories/icsa-23-208-03Third Party Advisory · US Government Resource
→
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-007_en.pdfVendor Advisory

Quick Facts

CVE IDCVE-2023-3346
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-120
CISA KEVNo
Affected1 vendor(s)
PublishedAug 3, 2023

Related CVEs (CWE-120)

CVE-2021-33972
10.0
CVE-2023-4260
10.0
CVE-2022-31481
10.0
CVE-2022-20827
10.0
CVE-2021-33975
10.0
CVE-2011-4862
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-3346 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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