CVE-2025-56365 in Matter
Summary
by MITRE • 07/15/2026
A reachable assertion vulnerability exists in the Matter SDK (connectedhomeip) before 1.4.0, in the interaction model command processing logic. When an InvokeCommandRequest is sent to a nonexistent endpoint and cluster (e.g., 0x34), the code incorrectly treats the endpoint as valid due to missing checks in CodegenDataModelProvider::Invoke. This causes a VerifyOrDie failure in ProcessCommandDataIB and results in a crash (SIGABRT). The issue has been acknowledged and fixed in a later revision (PR #37207).
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Analysis
by VulDB Data Team • 07/15/2026
The vulnerability under discussion represents a critical assertion failure within the Matter SDK ecosystem, specifically affecting versions prior to 1.4.0 in the connectedhomeip implementation. This flaw resides in the interaction model command processing logic where the system fails to properly validate endpoint and cluster identifiers during command execution. The issue manifests when an InvokeCommandRequest is directed toward non-existent endpoint and cluster combinations such as 0x34, creating a scenario where the system incorrectly assumes validity due to insufficient input validation mechanisms.
The technical exploitation of this vulnerability occurs through a specific code path involving CodegenDataModelProvider::Invoke function which lacks proper validation checks for endpoint existence. When processing commands destined for non-existent endpoints, the system fails to perform necessary verification steps that would normally prevent execution of invalid command sequences. This missing validation leads to a cascading failure where ProcessCommandDataIB encounters an assertion failure and subsequently triggers a SIGABRT signal causing the application to terminate abruptly. The flaw demonstrates a classic pattern of insufficient input sanitization and validation which allows malformed requests to bypass normal operational boundaries.
The operational impact of this vulnerability extends beyond simple service disruption to potentially enable denial-of-service attacks against Matter-enabled devices and ecosystems. Attackers could exploit this weakness by crafting malicious InvokeCommandRequest messages targeting non-existent endpoint identifiers, thereby causing legitimate processes to crash and terminate unexpectedly. This represents a significant concern for IoT device manufacturers and smart home ecosystem providers who rely on stable operation of their connected infrastructure. The vulnerability affects the fundamental reliability of Matter protocol implementations and could potentially disrupt user experiences across interconnected devices within smart home environments.
Security standards such as CWE-252 and CWE-682 provide relevant context for understanding this vulnerability, with CWE-252 specifically addressing "Unchecked return values" and CWE-682 covering "Incorrect calculation" which aligns with the assertion failure mechanism. From an ATT&CK framework perspective, this vulnerability maps to T1499.004 which covers "Endpoint Denial of Service" and potentially T1595.001 for "Network Denial of Service" when considering broader ecosystem impacts. The fix implemented in revision PR #37207 addresses the core validation gap by introducing proper checks within the CodegenDataModelProvider::Invoke function, ensuring that endpoint and cluster identifiers are properly verified before command processing proceeds.
Mitigation strategies should focus on immediate deployment of Matter SDK version 1.4.0 or later where the fix has been implemented. Organizations should also consider implementing additional input validation layers at network boundaries to detect and filter malformed command requests before they reach vulnerable components. Regular security assessments of IoT device firmware and protocol implementations are essential to identify similar gaps in validation logic. The vulnerability serves as a reminder of the critical importance of robust input validation in distributed systems and highlights how seemingly minor validation oversights can result in significant operational impacts. Implementation of comprehensive logging and monitoring around command processing activities will aid in detecting exploitation attempts and provide early warning capabilities for similar vulnerabilities that may arise in connected ecosystems.