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CVE-2023-4699· NVD / CVE Program· CNA Mitsubishi

Arbitrary Command Execution Vulnerability in Mitsubishi Electric proprietary protocol communication of multiple FA products

Noroxi assessment

Priority: Monitor (action score 36/100)

  • Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.74% (FIRST EPSS); higher than 53.9% 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 the record, no fixed version is available yet.

Low priority for now. 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

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.

CriticalCVSS 9.1 · v3.1—Proof of concept No fix recorded
Published
Nov 6, 2023
Updated
Jun 17, 2026
EPSS
0.7% · 53th percentile

Report tools

JSON

Action score

36

Monitor

Low priority for now.

CVSS
36 / 40 · 9.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
9.1
CNA · Mitsubishi
10.0
0.9 point gap

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

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
  • Proof of concept exists, no weaponized module
  • No fixed version yet

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

Follow CVE-2023-4699

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

VendorProduct
mitsubishielectricfx3u-32mt\/es firmware
mitsubishielectricfx3u-32mt\/es
mitsubishielectricfx3u-48mt\/es firmware
mitsubishielectricfx3u-48mt\/es
mitsubishielectricfx3u-64mt\/es firmware
mitsubishielectricfx3u-64mt\/es
mitsubishielectricfx3u-80mt\/es firmware
mitsubishielectricfx3u-80mt\/es
mitsubishielectricfx3u-128mt\/e firmware
mitsubishielectricfx3u-128mt\/e
mitsubishielectricfx3u-16mt\/es firmware
mitsubishielectricfx3u-16mt\/es

and 188 more

Affected versions

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

  • mitsubishielectric fx3g-14mr/ds firmwareall versions
  • mitsubishielectric fx3g-14mr/es firmwareall versions
  • mitsubishielectric fx3g-14mr/es-a firmwareall versions
  • mitsubishielectric fx3g-14mt/ds firmwareall versions
  • mitsubishielectric fx3g-14mt/dss firmwareall versions
  • mitsubishielectric fx3g-14mt/es firmwareall versions
  • mitsubishielectric fx3g-14mt/es-a firmwareall versions
  • mitsubishielectric fx3g-14mt/ess firmwareall versions
  • mitsubishielectric fx3g-24mr/ds firmwareall versions
  • mitsubishielectric fx3g-24mr/es firmwareall versions
  • mitsubishielectric fx3g-24mr/es-a firmwareall versions
  • mitsubishielectric fx3g-24mt/ds firmwareall versions
  • mitsubishielectric fx3g-24mt/dss firmwareall versions
  • mitsubishielectric fx3g-24mt/es firmwareall versions
  • mitsubishielectric fx3g-24mt/es-a firmwareall versions
  • mitsubishielectric fx3g-24mt/ess firmwareall versions
  • mitsubishielectric fx3g-40mr/ds firmwareall versions
  • mitsubishielectric fx3g-40mr/es firmwareall versions
  • mitsubishielectric fx3g-40mr/es-a firmwareall versions
  • mitsubishielectric fx3g-40mt/ds 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 MELSEC iQ-F Series FX5-40SSC-G

    • all versionsaffected

  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-40SSC-S

    • all versionsaffected

  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-80SSC-G

    • all versionsaffected

  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5-80SSC-S

    • all versionsaffected

  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MR/ES

    • all versionsaffected

  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MT/ES

    • all versionsaffected

  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-30MT/ESS

    • all versionsaffected

  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MR/ES

    • all versionsaffected

  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MT/ES

    • all versionsaffected

  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-40MT/ESS

    • all versionsaffected

  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MR/ES

    • all versionsaffected

  • Mitsubishi Electric Corporation MELSEC iQ-F Series FX5S-60MT/ES

    • all versionsaffected

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

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:12023-11-17

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.

  1. Published
  2. First PoC+11 d
  3. TodayOct 19, 2026+1078 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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
none
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
None
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-306 · Missing Authentication for Critical Function

CVSS vector

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

nvd-primary

Root cause

A function added for development or support ships to production without authentication. It often relies on the assumption that it is “only reachable from the internal network.”

The bug in code

The whole CWE-306 class

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

Vulnerable

ts
// Added for the support teamapp.post("/maintenance/reset", resetDevice);

Fixed

ts
if (config.maintenanceEnabled) {  app.post(    "/maintenance/reset",    requireSession, requireRole("admin"), resetDevice  );}

Attack context

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

ATT&CK techniques

—

Change log

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

References

Show all references (2 more)

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

All records