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Mf642cdw FirmwareOperating system · Canon

CVE-2023-0854

CRITICAL · 9.8 CVSS v3.1 Published 2023-05-11
Fix available
A fix is available. Upgrade to after 11.04 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 NetBIOS QNAME registering and communication process of Office / Small 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 LBP660C Series/LBP620C Series/MF740C Series/MF640C Series firmware Ver.11.04 and earlier sold in Japan. Color imageCLASS LBP660C Series/LBP 620C Series/X LBP1127C/MF740C Series/MF640C Series/X MF1127C firmware Ver.11.04 and earlier sold in US. i-SENSYS LBP660C Series/LBP620C Series/MF740C Series/MF640C Series, C1127P, C1127iF, C1127i firmware Ver.11.04 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

Buffer overflow vulnerability in the NetBIOS QNAME registration and communication process of Canon multifunction and laser printers. An attacker on the same network segment can exploit this to cause device unresponsiveness or achieve arbitrary code execution.

MitigationUpdate Canon printer firmware to version beyond 11.04. If immediate patching is not possible, isolate affected devices on a restricted network segment to reduce attack surface.

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
Mf642cdw FirmwareOperating system
Affected:<= 11.04
Mf644cdw FirmwareOperating system
Affected:<= 11.04
Mf741cdw FirmwareOperating system
Affected:<= 11.04
Mf743cdw FirmwareOperating system
Affected:<= 11.04
Mf745cdw FirmwareOperating system
Affected:<= 11.04
Lbp621c FirmwareOperating system
Affected:<= 11.04
Lbp622c FirmwareOperating system
Affected:<= 11.04
Lbp661c FirmwareOperating system
Affected:<= 11.04

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 web interface or print a configuration/network settings page to confirm the exact model name (e.g., MF642Cdw, MF644Cdw, MF741Cdw, MF743Cdw, MF745Cdw, LBP621C, LBP622C, LBP661C)
    Affected if Model is NOT one of the eight listed affected models (the vulnerability does not apply to other Canon models)
  2. Check installed firmware version
    In the printer web interface, navigate to the firmware or system information section, or print a configuration page that displays the firmware version
    Affected if Firmware version is 11.04 or lower (e.g., 11.03, 11.02, earlier versions)
  3. Verify NetBIOS is enabled
    In the printer web interface under Network or TCP/IP settings, check if NetBIOS over TCP/IP or NetBIOS name registration is turned on
    Affected if NetBIOS is enabled - the vulnerability exists in the NetBIOS QNAME registration process, so if NetBIOS is disabled the attack surface is not present

You are affected if your Canon printer is one of the eight listed models, runs firmware version 11.04 or lower, and has NetBIOS enabled in network settings.

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 11.04
Interim mitigation

Update Canon printer firmware to version beyond 11.04. If immediate patching is not possible, isolate affected devices on a restricted network segment to reduce attack surface.

Recommended fix Moderate confidence

Firmware version > 11.04 (check Canon support for your specific model's latest available version)

  1. Check the Canon support website (canon.com) for your specific printer model firmware section
  2. Navigate to the drivers and firmware download page for your affected Canon printer model
  3. Download the latest available firmware version (later than 11.04) for your specific model
  4. Consult the printer's user manual for firmware update instructions, typically via the web interface or Canon MF/LBP Windows utility
  5. Ensure the printer is connected to a stable power source during the firmware update process
  6. Access the printer's web administration interface or use the appropriate Canon firmware update utility
  7. Upload and install the firmware update, allowing the process to complete without interruption
  8. After reboot, verify the firmware version has been updated successfully
Caveat Review release notes for any functionality changes; ensure compatible printer models and network configurations before updating

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

Fix this in Mf642cdw Firmware Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
15.0 hours of engineering $2,640
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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-2023-0854 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