CVE-2024-12647
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 · uneditedBuffer overflow in CPCA font download processing of 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 MF656Cdw/Satera MF654Cdw firmware v05.04 and earlier sold in Japan. Color imageCLASS MF656Cdw/Color imageCLASS MF654Cdw/Color imageCLASS MF653Cdw/Color imageCLASS MF652Cdw/Color imageCLASS LBP633Cdw/Color imageCLASS LBP632Cdw firmware v05.04 and earlier sold in US. i-SENSYS MF657Cdw/i-SENSYS MF655Cdw/i-SENSYS MF651Cdw/i-SENSYS LBP633Cdw/i-SENSYS LBP631Cdw firmware v05.04 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 confidenceA buffer overflow vulnerability exists in the CPCA (Canon Printer Control Architecture) font download processing of affected Canon multifunction and laser printers. By sending specially crafted font data to the device, an attacker on the same network segment can overflow a buffer, potentially causing denial of service or achieving arbitrary code execution with elevated privileges.
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<= 05.04<= 05.04<= 05.04<= 05.04<= 05.04<= 05.04<= 05.04<= 05.04CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Identify the printer modelCheck the device label or access the printer's web interface (http://[printer-ip]) or print a configuration page to confirm the exact model number (MF455dw, MF453dw, MF452dw, MF451dw, MF465dw, MF462dw, MF656cdw, or MF654cdw)Affected if The model is one of the eight listed affected models
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Check the installed firmware versionAccess the printer's web interface and navigate to the firmware or system information page, or print a configuration/report page that displays the firmware versionAffected if The firmware version is 05.04 or lower (any version <= 05.04)
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Confirm CPCA service accessibilityCheck if port 9000/tcp (default CPCA port) or the printer's web interface is reachable from network segments containing untrusted devices. Use 'nc -zv [printer-ip] 9000' or a port scannerAffected if The CPCA service (port 9000/tcp) or web interface is accessible from an untrusted network segment
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Verify font download functionality is enabledAccess the printer's web interface and check the settings under 'Font Download', 'PCL Font', or 'Download Font' configuration menus. If the web interface is not available, check if the printer accepts LPR, raw print jobs, or PJL commands related to font loadingAffected if Font download processing is enabled and accessible (this is the attack surface for the vulnerability)
Your environment is affected if you have one of the eight listed Canon printer models running firmware version 05.04 or lower with the CPCA/font download feature accessible from your network.
Generated from the published advisory. Verify against your own configuration.
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 · scopedUpdate the affected printer firmware to version v05.05 or later as provided by Canon. Network segmentation and restricting access to trusted devices can reduce attack surface until firmware updates are applied.
Firmware update to latest version available on Canon support website (v05.05 or later)
- 1. Identify the exact model number of the affected Canon printer from the list: MF455dw, MF453dw, MF452dw, MF451dw, MF465dw, MF462dw, MF656cdw, or MF654cdw
- 2. Determine the current firmware version by printing a configuration page or accessing the web interface
- 3. Visit the official Canon support website for your region (canon.jp, www.usa.canon.com, or www.canon-europe.com depending on where the device was purchased)
- 4. Navigate to the support/drivers section and search for your specific printer model
- 5. Download the latest firmware update available from Canon
- 6. Follow Canon's firmware update instructions, typically via the Canon MF/LBP Printer Driver Installation Guide or the printer's web interface under Administration > Firmware Update
- 7. After updating, verify the firmware version has changed from <=05.04 to the latest available version
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2024-12647 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-12647 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- 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