CVE-2025-14237 Overview
CVE-2025-14237 is a critical buffer overflow vulnerability affecting XPS font parse processing in Canon Small Office Multifunction Printers and Laser Printers. This vulnerability allows an attacker on the same network segment to trigger the affected product to become unresponsive or execute arbitrary code on the device.
The vulnerability exists in the firmware's handling of XPS (XML Paper Specification) font data, where improper bounds checking during font parsing can lead to memory corruption. Successful exploitation could allow an unauthenticated attacker with network access to completely compromise affected Canon printers, potentially using them as a foothold for further network attacks.
Critical Impact
Network-accessible buffer overflow enabling remote code execution on Canon printers without authentication, potentially compromising network infrastructure and enabling lateral movement.
Affected Products
- Canon Satera LBP670C Series / Satera MF750C Series firmware v06.02 and earlier (Japan)
- Canon Color imageCLASS LBP630C / Color imageCLASS MF650C Series / imageCLASS LBP230 Series / imageCLASS X LBP1238 II / imageCLASS MF450 Series / imageCLASS X MF1238 II / imageCLASS X MF1643i II / imageCLASS X MF1643iF II firmware v06.02 and earlier (US)
- Canon i-SENSYS LBP630C Series / i-SENSYS MF650C Series / i-SENSYS LBP230 Series / 1238P II / 1238Pr II / i-SENSYS MF450 Series / i-SENSYS MF550 Series / 1238i II / 1238iF II / imageRUNNER 1643i II / imageRUNNER 1643iF II firmware v06.02 and earlier (Europe)
Discovery Timeline
- January 16, 2026 - CVE-2025-14237 published to NVD
- January 16, 2026 - Last updated in NVD database
Technical Details for CVE-2025-14237
Vulnerability Analysis
This vulnerability is classified as CWE-787 (Out-of-bounds Write), a memory corruption issue that occurs when the XPS font parsing functionality in Canon printer firmware fails to properly validate input boundaries. When processing specially crafted XPS font data, the firmware writes data beyond the allocated buffer boundaries, corrupting adjacent memory regions.
The network-accessible nature of this vulnerability is particularly concerning for enterprise environments, as printers are often overlooked in security assessments yet remain connected to sensitive network segments. An attacker with access to the same network segment can exploit this vulnerability without requiring any authentication or user interaction.
Root Cause
The root cause is improper bounds checking in the XPS font parser implementation within the Canon printer firmware. When parsing font data embedded in XPS documents, the firmware allocates a fixed-size buffer but fails to validate that incoming font data fits within the allocated space. This allows an attacker to supply oversized or malformed font data that overwrites adjacent memory, potentially including control structures that determine program execution flow.
Attack Vector
The attack can be executed remotely by an attacker on the same network segment as the vulnerable printer. The exploitation process involves:
- The attacker identifies a vulnerable Canon printer on the network through service discovery
- A maliciously crafted XPS document containing specially formatted font data is sent to the printer
- The XPS font parser processes the malformed font data without proper validation
- The oversized font data overflows the allocated buffer, corrupting adjacent memory
- Depending on the specific memory layout, this can result in denial of service (printer becomes unresponsive) or arbitrary code execution
The vulnerability does not require authentication and can be triggered through standard print protocols, making it highly accessible to attackers with network access. For detailed technical information, refer to the Canon PSIRT Advisory CP2026-001.
Detection Methods for CVE-2025-14237
Indicators of Compromise
- Unexpected printer crashes, restarts, or unresponsive states without clear cause
- Unusual network traffic patterns to printers, particularly involving XPS document transfers
- Anomalous outbound connections from printer IP addresses to external hosts
- Print queue errors or failures specifically related to XPS format documents
Detection Strategies
- Monitor network traffic for suspicious XPS document transfers to printer devices
- Implement network segmentation monitoring to detect unauthorized access attempts to printer VLANs
- Deploy network-based intrusion detection rules to identify malformed XPS font data patterns
- Track printer firmware versions and alert on devices running vulnerable versions (v06.02 and earlier)
Monitoring Recommendations
- Enable logging on network infrastructure to capture printer-related traffic anomalies
- Configure SIEM alerts for unusual printer behavior patterns including unexpected reboots
- Monitor for new processes or connections originating from printer device IP addresses
- Implement asset inventory tracking to identify all Canon printers running vulnerable firmware versions
How to Mitigate CVE-2025-14237
Immediate Actions Required
- Identify all Canon printers in your environment running firmware v06.02 or earlier
- Isolate vulnerable printers to dedicated network segments with restricted access
- Apply firmware updates as provided by Canon to address the vulnerability
- Disable XPS printing functionality if not required until patches can be applied
Patch Information
Canon has released security advisories addressing this vulnerability. Administrators should download and apply the latest firmware updates from Canon's official support channels. Refer to the Canon Vulnerability Response page for Japan, Canon USA Service Notice for US customers, or Canon Europe Product Security for European regions.
Workarounds
- Segment printers on isolated VLANs with strict access controls limiting network exposure
- Implement firewall rules to restrict printer access to only authorized workstations and print servers
- Disable XPS printing support on vulnerable devices if the feature is not business-critical
- Enable access controls and authentication on printer management interfaces where available
# Network segmentation example (firewall rules)
# Restrict printer VLAN access to authorized print servers only
# Replace with your actual network configuration
iptables -A FORWARD -s 10.0.0.0/24 -d 10.1.100.0/24 -p tcp --dport 9100 -j ACCEPT
iptables -A FORWARD -s 10.0.0.0/24 -d 10.1.100.0/24 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
