CVE-2025-3078
📋 TL;DR
A passback vulnerability in Canon production printers and office multifunction printers allows attackers to bypass authentication mechanisms and gain unauthorized access to device functions. This affects organizations using vulnerable Canon printer models in their networks. The vulnerability leverages improper credential handling to escalate privileges.
💻 Affected Systems
- Canon production printers
- Canon office multifunction printers
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of printer systems allowing data exfiltration, device takeover for lateral movement, or disruption of printing operations across the organization.
Likely Case
Unauthorized access to printer settings, capture of printed documents, or misuse of printer functions for malicious activities.
If Mitigated
Limited impact with proper network segmentation and access controls preventing exploitation attempts from reaching vulnerable devices.
🎯 Exploit Status
Requires network access to vulnerable printer and knowledge of passback techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware updates specified in Canon advisories
Vendor Advisory: https://psirt.canon/advisory-information/cp2025-004/
Restart Required: Yes
Instructions:
1. Identify affected printer models from Canon advisories. 2. Download latest firmware from Canon support portal. 3. Apply firmware update following Canon's installation guide. 4. Restart printer to complete installation.
🔧 Temporary Workarounds
Network Segmentation
allIsolate printers on separate VLANs with strict access controls
Access Control Lists
allImplement firewall rules to restrict printer access to authorized users only
🧯 If You Can't Patch
- Disable unnecessary printer services and features
- Implement strict authentication and monitor for unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Check printer firmware version against Canon's vulnerability list at https://psirt.canon/advisory-information/cp2025-004/Check Version:
Check printer web interface or use SNMP query to verify firmware versionVerify Fix Applied:
Confirm firmware version has been updated to patched version specified in Canon advisory📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful access
- Unusual configuration changes to printer settings
- Access from unauthorized IP addresses
Network Indicators:
- Unusual traffic patterns to printer management interfaces
- Authentication bypass attempts on printer ports
SIEM Query:
source="printer_logs" AND (event_type="auth_failure" OR event_type="config_change")🔗 References
- https://canon.jp/support/support-info/250519vulnerability-response
- https://corporate.jp.canon/caution/160106
- https://psirt.canon/advisory-information/cp2025-004/
- https://psirt.canon/hardening/
- https://www.canon-europe.com/support/product-security
- https://www.usa.canon.com/about-us/to-our-customers/cp2025-004-vulnerability-mitigation-remediation-for-production-printers-office-small-office-multifunction-printers-laser-printers
