dbcve.org
Mf755cdw FirmwareOperating system · Canon

CVE-2023-6234

CRITICAL · 9.8 CVSS v3.1 Published 2024-02-06
Fix available
A fix is available. Upgrade to after 03.07 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Buffer overflow in CPCA Color LUT Resource Download process of Office Multifunction Printers and Laser Printers(*) which may allow an attacker on the network segment to trigger the affected product being unresponsive or to execute arbitrary code.*: Satera LBP670C Series/Satera MF750C Series firmware v03.07 and earlier sold in Japan. Color imageCLASS LBP674C/Color imageCLASS X LBP1333C/Color imageCLASS MF750C Series/Color imageCLASS X MF1333C Series firmware v03.07 and earlier sold in US. i-SENSYS LBP673Cdw/C1333P/i-SENSYS MF750C Series/C1333i Series firmware v03.07 and earlier sold in Europe.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · high confidence

A buffer overflow vulnerability exists in the CPCA (Canon Printer Communication Architecture) Color LUT Resource Download process of affected Canon printer firmware v03.07 and earlier. An attacker on the same network segment can exploit this to cause the device to become unresponsive or achieve arbitrary code execution. This is a critical flaw affecting multiple Satera, Color imageCLASS, and i-SENSYS printer series sold in Japan, US, and Europe.

MitigationApply Canon firmware version v03.08 or later to all affected devices; until patched, isolate affected printers on a restricted network segment to reduce exposure to adjacent network attackers.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Mf755cdw FirmwareOperating system
Affected:<= 03.07
Mf753cdw FirmwareOperating system
Affected:<= 03.07
Mf751cdw FirmwareOperating system
Affected:<= 03.07
Lbp674c FirmwareOperating system
Affected:<= 03.07
Lbp672c FirmwareOperating system
Affected:<= 03.07
Lbp671c FirmwareOperating system
Affected:<= 03.07
Mf1238 Ii FirmwareOperating system
Affected:<= 03.07
Mf1333c FirmwareOperating system
Affected:<= 03.07

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify printer model
    Access the printer's web interface (embedded web server) or check the control panel to confirm the exact model name (e.g., Mf755cdw, Lbp674c). Compare against the list of affected models.
    Affected if Model is one of: Mf755cdw, Mf753cdw, Mf751cdw, Lbp674c, Lbp672c, Lbp671c, Mf1238 Ii, or Mf1333c.
  2. Check installed firmware version
    Log into the printer web interface (usually via HTTP/HTTPS at the printer IP address) and navigate to the Settings or Device Information section to view the firmware version. Alternatively, print a configuration page from the control panel.
    Affected if Firmware version is 03.07 or earlier.
  3. Verify CPCA service is active
    Canon printers typically have CPCA (Canon Printer Communication Architecture) enabled by default for network printing and management. Check the printer web interface under Network Settings or Communication Settings to confirm CPCA/Network communication is enabled.
    Affected if CPCA is enabled (this is the default state for network-capable Canon printers).

The printer is affected if it matches one of the listed models AND is running firmware version 03.07 or earlier, with CPCA network communication enabled.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to a release after 03.07
Interim mitigation

Apply Canon firmware version v03.08 or later to all affected devices; until patched, isolate affected printers on a restricted network segment to reduce exposure to adjacent network attackers.

Recommended fix Moderate confidence

Firmware version 03.08 or later (newer than the vulnerable v03.07)

  1. 1. Identify your specific Canon printer model from the affected list (MF755cdw, MF753cdw, MF751cdw, LBP674c, LBP672c, LBP671c, MF1238 II, MF1333c or regional equivalents)
  2. 2. Access your printer's web interface or control panel to check the current firmware version
  3. 3. Navigate to the Canon support website for your region (canon.jp, www.usa.canon.com, or www.canon-europe.com depending on your location)
  4. 4. Search for your printer model and locate the firmware download section
  5. 5. Download the latest firmware version available - ensure it is version 03.08 or later
  6. 6. Follow Canon's provided firmware update instructions (typically via the web interface, Canon MF/LBP Printer Driver, or USB connection)
  7. 7. After updating, verify the new firmware version displays 03.08 or higher
  8. 8. Confirm the printer returns to normal operational status
Caveat Firmware updates typically require temporary printer downtime; ensure print jobs are completed before initiating update

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Mf755cdw Firmware Scoped from the published advisory
  • Consultation6.0 h
  • Implementation16.0 h
  • Testing8.0 h
  • Review / QA4.0 h
34.0 hours of engineering $6,000
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-6234 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data