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silicon-labs-z-wave-sdk

When SmartStart Inclusion fails during the onboarding of a Z-Wave PIR sensor, the sensor will join the network as a non-secure device. This vulnerability exists in Silicon Labs' Z-Wave PIR Sensor Reference design delivered as part of SiSDK v2025.6.0 and v2025.6.1.

CVE-2025-10693 is a vulnerability classified under CWE-757 (Selection of Less-Secure Algorithm During Negotiation, also known as an algorithm downgrade attack) found in Silicon Labs' Z-Wave SDK, specifically version 2025.6.0. The issue arises during the SmartStart Inclusion process of Z-Wave PIR sensors, where a failure in onboarding causes the sensor to join the Z-Wave network as a non-secure device rather than using secure communication protocols. This downgrade from secure to non-secure communication effectively bypasses the cryptographic protections intended to safeguard the network and its devices. The vulnerability stems from the SDK's reference design for the PIR sensor, which does not enforce fallback to secure algorithms or abort the inclusion process upon failure, allowing an attacker to exploit this behavior. The attack vector is network-based, requiring no prior authentication but necessitating user interaction during device onboarding. The CVSS 4.0 score of 7.6 reflects high severity, with significant impacts on confidentiality and integrity, as attackers could intercept or manipulate sensor data or commands. Availability impact is low, and there is no scope change beyond the vulnerable component. No public exploits have been reported yet, but the vulnerability poses a substantial risk to IoT environments relying on Z-Wave technology for security and automation. The flaw highlights the importance of robust secure onboarding mechanisms in IoT device ecosystems.

Detailed information about CVE-2025-10693: CWE-757 Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade') in silabs.com Silicon Labs Z-Wa

CVE-2025-10693: CWE-757 Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade') in silabs.com Silicon Labs Z-Wave SDK - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-10693: CWE-757 Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade') in silabs.com Silicon Labs Z-Wave SDK

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