CVE-2024-9423 in LaserJet Printer
Summary
by MITRE • 10/02/2024
Certain HP LaserJet printers may potentially experience a denial of service when a user sends a raw JPEG file to the printer. The printer displays a “JPEG Unsupported” message which may not clear, potentially blocking queued print jobs.
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Analysis
by VulDB Data Team • 02/25/2026
The vulnerability identified as CVE-2024-9423 affects specific HP LaserJet printer models and represents a denial of service condition triggered by processing raw JPEG files. This issue demonstrates a critical weakness in the printer's input validation and error handling mechanisms, where the device fails to properly manage malformed or unsupported input data. The flaw occurs during the print job processing phase when the printer receives a raw JPEG file that it cannot properly interpret or render, leading to a cascading failure in the print queue management system.
The technical implementation of this vulnerability stems from insufficient input sanitization within the printer's embedded operating system and print processing engine. When a JPEG file is transmitted to the printer, the device attempts to parse the image data without adequate validation of the file format or structure. This parsing failure results in the printer displaying a persistent "JPEG Unsupported" message that remains visible on the device interface and prevents normal print queue operations. The vulnerability is classified under CWE-20 as "Improper Input Validation" and aligns with ATT&CK technique T1499.004 for "Endpoint Denial of Service" through resource exhaustion or system instability.
The operational impact of this vulnerability extends beyond simple service disruption as it creates a persistent blocking condition that affects all subsequent print jobs in the queue. Printers affected by this vulnerability may become completely unresponsive to new print requests until the problematic job is manually cleared from the queue, potentially causing significant productivity losses in office environments. Network administrators face challenges in maintaining consistent print services as the issue can affect multiple users simultaneously and may require physical intervention at the printer device level to resolve the queue blocking state.
Mitigation strategies for CVE-2024-9423 should focus on both immediate operational responses and long-term architectural improvements. Organizations should implement print queue monitoring systems to detect and automatically clear stuck jobs before they can impact other users. Network administrators should consider disabling raw print capabilities for JPEG files through printer configuration settings or network-level filtering. Additionally, regular firmware updates from HP should be prioritized as the manufacturer is expected to provide patches that improve input validation and error handling mechanisms. The vulnerability highlights the importance of robust input validation in embedded systems and demonstrates how seemingly simple file processing operations can create significant service disruption when proper error handling is not implemented.