CVE-2025-14859
HighCVSS 7.0Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
Semtech LR11xx LoRa transceivers implement secure boot with a non-standard hashing algorithm vulnerable to second preimage attacks. An attacker with physical access can generate a malicious firmware image with a hash collision, bypassing secure boot and installing unauthorized firmware.
Risk Assessment
An attacker can permanently compromise the device by installing malicious firmware, leading to full control or disruption of IoT devices.
Recommendation
Update the firmware of devices using Semtech LR11xx to a version that uses a stronger hashing algorithm (e.g., SHA-256).
Other vulnerabilities in Semtech LR11xx
Original NVD description (English source)
The Semtech LR11xx LoRa transceivers implement secure boot functionality using digital signatures to authenticate firmware. However, the implementation uses a non-standard cryptographic hashing algorithm that is vulnerable to second preimage attacks. An attacker with physical access to the device can exploit this weakness to generate a malicious firmware image with a hash collision, bypassing the secure boot verification mechanism and installing arbitrary unauthorized firmware on the device.