CVE-2025-54777 in bizhub
Summary
by MITRE • 08/29/2025
Uncaught exception issue exists in Multiple products in bizhub series. If a malformed file is imported as an S/MIME Email certificate, it may cause a denial-of-service issue that disable the Web Connection feature.
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Analysis
by VulDB Data Team • 08/29/2025
The vulnerability identified as CVE-2025-54777 represents a critical uncaught exception scenario affecting multiple products within the bizhub series, specifically targeting the S/MIME email certificate import functionality. This flaw manifests when the system encounters a malformed file during the certificate import process, leading to an abrupt termination of the Web Connection feature. The issue stems from inadequate input validation and error handling mechanisms within the S/MIME certificate processing module, which fails to properly sanitize or reject malformed certificate data before attempting to parse and utilize it within the system's cryptographic framework.
From a technical perspective, the vulnerability operates at the intersection of cryptographic processing and application error handling, creating a denial-of-service condition that disables core web connectivity functions. The system's failure to anticipate and gracefully handle malformed S/MIME certificate files results in an unhandled exception that cascades through the application's execution flow, ultimately terminating the web connection service. This behavior aligns with CWE-459, which addresses incomplete cleanup issues in software systems, and specifically demonstrates weaknesses in exception handling and resource management. The vulnerability's impact extends beyond simple service disruption as it affects the system's ability to maintain secure email communications and web-based administrative functions.
The operational implications of this vulnerability are significant for organizations relying on bizhub series devices for document management and secure communications. When the Web Connection feature becomes disabled, users lose access to critical web-based functionalities including remote administration, firmware updates, and secure email processing capabilities. The denial-of-service condition can persist until manual intervention occurs, requiring system restarts or administrative access to restore functionality. This vulnerability directly impacts the availability and integrity of business-critical systems, potentially disrupting workflows that depend on secure email communications and web-based document processing. Organizations may experience cascading effects where the inability to process S/MIME certificates affects downstream applications and services that rely on these secure communication channels.
Security practitioners should consider this vulnerability in the context of the ATT&CK framework, particularly under the T1499.004 technique for network denial of service, and T1566.001 for social engineering through malicious email attachments. The vulnerability creates an attack surface where malicious actors could potentially exploit the malformed certificate import functionality to repeatedly trigger denial-of-service conditions, particularly in environments where automated certificate processing occurs. Mitigation strategies should include implementing robust input validation for S/MIME certificate files, deploying application-level firewalls to filter suspicious certificate data, and establishing monitoring protocols to detect unusual patterns in certificate import activities. Regular firmware updates and patches should be prioritized to address the underlying exception handling deficiencies, while network segmentation can help limit the impact of successful exploitation attempts. Additionally, organizations should implement proper logging and alerting mechanisms to quickly identify when the Web Connection feature becomes disabled due to certificate processing errors, enabling rapid response to potential attacks.