NVD / CVE Program· CNA Mitsubishi

CVE-2023-3346: Denial of Service (DoS) and Remote Code Execution Vulnerability in MITSUBISHI CNC Series

Noroxi assessment

Priority: Plan (action score 40/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 2% (FIRST EPSS); higher than 81.6% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
According to the record, no fixed version is available yet.

Add it to your regular patch cycle. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

CriticalCVSS 9.8 · v3.1—No exploit No fix recorded

BDU:2023-04237

Published: Aug 3, 2023
Updated: Jun 17, 2026
EPSS: 2.0% · 81th percentile
CWE: CWE-120

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Action score

Plan

Add it to your regular patch cycle.

CVSS: 39 / 40 · 9.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 1 / 30 · 2.0%

CISA SSVC decision

Exploitation: none
Automatable: yes
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 9.8
CNA · Mitsubishi: 9.8; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

ProductVersion

Vendor	Product	CPE
mitsubishielectric	c80 firmware	cpe:2.3:o:mitsubishielectric:c80_firmware
mitsubishielectric	c80	cpe:2.3:h:mitsubishielectric:c80
mitsubishielectric	e70 firmware	cpe:2.3:o:mitsubishielectric:e70_firmware
mitsubishielectric	e70	cpe:2.3:h:mitsubishielectric:e70
mitsubishielectric	e80 firmware	cpe:2.3:o:mitsubishielectric:e80_firmware
mitsubishielectric	e80	cpe:2.3:h:mitsubishielectric:e80
mitsubishielectric	m70v firmware	cpe:2.3:o:mitsubishielectric:m70v_firmware
mitsubishielectric	m70v	cpe:2.3:h:mitsubishielectric:m70v
mitsubishielectric	m720vs firmware	cpe:2.3:o:mitsubishielectric:m720vs_firmware
mitsubishielectric	m720vs	cpe:2.3:h:mitsubishielectric:m720vs
mitsubishielectric	m720vs 15-type firmware	cpe:2.3:o:mitsubishielectric:m720vs_15-type_firmware
mitsubishielectric	m720vs 15-type	cpe:2.3:h:mitsubishielectric:m720vs_15-type

and 30 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

mitsubishielectric c80 firmwareall versions
mitsubishielectric e70 firmwareall versions
mitsubishielectric e80 firmwareall versions
mitsubishielectric m70v firmwareall versions
mitsubishielectric m720vs 15-type firmwareall versions
mitsubishielectric m720vs firmwareall versions
mitsubishielectric m720vw firmwareall versions
mitsubishielectric m730vs 15-type firmwareall versions
mitsubishielectric m730vs firmwareall versions
mitsubishielectric m730vw firmwareall versions
mitsubishielectric m750vs 15-type firmwareall versions
mitsubishielectric m750vs firmwareall versions
mitsubishielectric m750vw firmwareall versions
mitsubishielectric m80 firmwareall versions
mitsubishielectric m800s firmwareall versions
mitsubishielectric m800vs firmwareall versions
mitsubishielectric m800vw firmwareall versions
mitsubishielectric m800w firmwareall versions
mitsubishielectric m80v firmwareall versions
mitsubishielectric m80vw firmwareall versions

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Mitsubishi). Independent of NVD's CPE analysis and usually ahead of it.

Mitsubishi Electric Corporation MITSUBISHI CNC C80 Series C80
- System Number BND-2036W000 versions BF and prioraffected
Mitsubishi Electric Corporation MITSUBISHI CNC E70 Series E70
- System Number BND-1022W000 versions LF and prioraffected
Mitsubishi Electric Corporation MITSUBISHI CNC E80 Series E80
- System Number BND-2009W000 versions FB and prioraffected
Mitsubishi Electric Corporation MITSUBISHI CNC IoT Unit Data Acquisition Unit
- System Number BND-2041W002 all versionsaffected
Mitsubishi Electric Corporation MITSUBISHI CNC IoT Unit Remote Service Gateway Unit
- System Number BND-2041W001 versions AD and prioraffected
Mitsubishi Electric Corporation MITSUBISHI CNC M700V Series M720VS
- System Number BND-1012W000 versions LF and prioraffected
Mitsubishi Electric Corporation MITSUBISHI CNC M700V Series M720VW
- System Number BND-1015W000 versions LF and prioraffected
Mitsubishi Electric Corporation MITSUBISHI CNC M700V Series M730VS
- System Number BND-1012W000 versions LF and prioraffected
Mitsubishi Electric Corporation MITSUBISHI CNC M700V Series M730VW
- System Number BND-1015W000 versions LF and prioraffected
Mitsubishi Electric Corporation MITSUBISHI CNC M700V Series M750VS
- System Number BND-1012W002 versions LF and prioraffected
Mitsubishi Electric Corporation MITSUBISHI CNC M700V Series M750VW
- System Number BND-1015W002 versions LF and prioraffected
Mitsubishi Electric Corporation MITSUBISHI CNC M70V Series M70V
- System Number BND-1018W000 versions LF and prioraffected

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

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

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1char buf[256];
2memcpy(buf, pkt->data, pkt->len);

Fixed

1char buf[256];
2if (pkt->len > sizeof(buf)) {
3  return -EINVAL;
4}
5memcpy(buf, pkt->data, pkt->len);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

jvn.jp/vu/JVNVU90352157/index.html

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records