CVE-2026-79389 in T18161 S
Summary
by MITRE • 09/04/2026
Trueview T18161 S 6.0.23.4 contains an improper verification in MQTT command processing. An attacker with network access can replay or modify captured MQTT messages, including security-related nonce, timestamp, and signature fields, and the device accepts the modified messages and executes the associated commands.
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Analysis
by VulDB Data Team • 09/04/2026
The vulnerability identified in Trueview T18161 S version 6.0.23.4 represents a critical failure in message integrity verification within its MQTT implementation. This flaw allows an attacker who has established network access to intercept, replay, or modify captured MQTT messages without detection. The core technical deficiency lies in the device's inability to properly validate security-related fields such as nonces, timestamps, and digital signatures during command processing. By accepting modified messages that contain altered or reused cryptographic elements, the firmware fails to enforce strict statefulness and temporal validity checks, effectively bypassing authentication mechanisms designed to prevent unauthorized access and tampering.
From a technical perspective, this issue aligns with CWE-347 Improper Verification of Cryptographic Signature, as well as CWE-294 Authentication Bypass by Capture-replay. The absence of robust nonce validation means that previously valid command sequences can be replayed indefinitely to trigger unintended actions on the device. Similarly, the lack of strict timestamp enforcement allows for time-shift attacks where old messages are accepted as current operations. This breakdown in cryptographic verification undermines the fundamental security principles of integrity and authenticity required for secure IoT communications over MQTT protocols.
The operational impact of this vulnerability is severe, particularly in environments relying on Trueview T18161 S devices for critical infrastructure or surveillance applications. An attacker can exploit these weaknesses to execute arbitrary commands with elevated privileges, potentially leading to unauthorized control of the device functionality. This could result in service disruption, data exfiltration if sensitive telemetry is transmitted via MQTT, or physical safety risks depending on the specific operational context of the hardware. The ability to modify security fields means that even authenticated sessions can be hijacked or manipulated without triggering standard alerting mechanisms associated with authentication failures.
Mitigation strategies must focus on strengthening message validation logic within the firmware update process. Developers should implement strict checks for nonce uniqueness and expiration, ensuring each request is processed only once within a defined time window to prevent replay attacks. Timestamps must be validated against server-side clocks with acceptable tolerance limits to reject stale or future-dated messages. Additionally, digital signatures should be verified using immutable keys that are not exposed in client-transmitted data fields. Network-level controls such as TLS encryption and mutual authentication can provide additional layers of defense by ensuring message confidentiality and integrity during transit, although these do not replace the need for proper application-layer validation logic within the device firmware itself.