CVE-2026-21549 in T8100
Summary
by MITRE • 08/03/2026
In modem, there is a possible improper input validation. This could lead to remote denial of service with no additional execution privileges needed
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Analysis
by VulDB Data Team • 08/03/2026
This vulnerability represents a critical input validation flaw that exists within modem firmware or software components, creating a potential pathway for remote denial of service attacks. The issue stems from inadequate validation mechanisms that fail to properly sanitize or verify incoming data streams, allowing malicious actors to craft specific inputs that can disrupt normal operational functions. Such vulnerabilities typically arise when developers assume trusted input sources or fail to implement comprehensive validation checks at multiple layers of the communication stack. The absence of additional execution privileges requirements means that attackers can exploit this weakness without needing elevated permissions, making the attack surface significantly broader and more accessible to threat actors with basic technical capabilities.
The technical implementation of this vulnerability likely occurs within the modem's protocol handling mechanisms where incoming data packets or commands are processed without sufficient validation controls. This could manifest in various forms including malformed packet structures, oversized data payloads, or specially crafted sequences that cause the modem to enter an unstable state or crash entirely. The flaw may be present in network protocol implementations, command interpreters, or buffer management systems that process external communications. From a cybersecurity perspective, this vulnerability aligns with common weakness patterns identified in the CWE database under categories related to input validation failures and improper error handling within networked applications.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise network availability and reliability for connected devices. Remote attackers can leverage this weakness to systematically deny service to legitimate users, causing widespread connectivity issues that may affect business operations or consumer services. The exploitability characteristics suggest that the attack could be automated and executed at scale, making it particularly dangerous in environments where modems serve as critical infrastructure components. Organizations relying on modem-based connectivity for essential services face significant risk exposure, as adversaries could target these devices through various network access points without requiring physical proximity or specialized credentials.
Mitigation strategies should focus on implementing robust input validation mechanisms throughout the modem's processing pipeline, including comprehensive data sanitization and size limitation controls. Network segmentation and access control measures can help limit potential exploitation vectors while regular firmware updates and security patches should be deployed to address known vulnerabilities. The implementation of intrusion detection systems specifically designed to monitor for anomalous modem behavior patterns can provide early warning capabilities. From a defensive standpoint, organizations should conduct thorough vulnerability assessments of their modem deployments and establish monitoring procedures that can detect unusual traffic patterns or system states indicative of exploitation attempts. This vulnerability highlights the importance of applying security-by-design principles to network infrastructure components and demonstrates how seemingly minor input validation gaps can create significant operational risks across enterprise and consumer environments alike.