CVE-2025-9903
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 · uneditedOut-of-bounds write vulnerabilities in print processing of Generic Plus PCL6 Printer Driver / Generic Plus UFR II Printer Driver / Generic Plus LIPS4 Printer Driver / Generic Plus LIPSLX Printer Driver / Generic Plus PS Printer Driver / UFRII LT Printer Driver / CARPS2 Printer Driver / Generic FAX Driver / LIPS4 Printer Driver / LIPSLX Printer Driver / UFR II Printer Driver / PS Printer Driver / PCL6 Printer Driver
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 · moderate confidenceThis vulnerability involves out-of-bounds write flaws in the print processing functionality of multiple Canon printer driver models. An attacker could potentially exploit this by sending specially crafted print jobs to execute arbitrary code or cause a denial of service on the affected system.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- High
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- Low
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L
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 Canon printer driver installationCheck system for installed Canon printer drivers by reviewing installed programs (Windows: Add/Remove Programs, macOS: System Preferences > Printers & Scanners, Linux: lpstat -t or dpkg -l | grep canon)Affected if Canon printer driver software is present on the system
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Retrieve installed Canon driver versionAccess the printer driver properties through the operating system's printer management interface, or run the Canon driver utility with version check flag if availableAffected if Unable to determine driver version or version shows outdated driver package
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Verify print processing functionality is enabledConfirm the Canon printer driver is set as active/default and print spooler service is running (Windows: services.msc > Print Spooler, Linux: cups service status)Affected if Printer driver is installed and print services are active, making the vulnerability reachable
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Review print job logs for anomaliesExamine printer spooler logs or CUPS logs (/var/log/cups/access_log on Linux, Windows Event Viewer under Microsoft-Windows-PrintService) for unexpected or malformed print job entriesAffected if Suspicious or malformed print job records appear in logs indicating potential exploitation attempts
A system is affected if it has a Canon printer driver installed with a version that falls within the affected range and the print processing functionality is enabled and reachable.
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.
From vendor dataUpdate Canon printer drivers to the latest versions provided by Canon through their official support channels, as patches address the out-of-bounds write vulnerabilities in print processing.
- Consultation2.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-9903 — 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-2025-9903 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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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.
- 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
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