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
See all- CVE-2026-6232Medium
An out-of-bounds write vulnerability in the SPI host command interface of Semtech's LR11xx transceiver firmware. A crafted SPI host command with an oversized length field can cause the firmware to write up to 254 arbitrary bytes past the bounds of an internal, non-persistent memory buffer. Exploitation requires physical access to the device and logical access to the SPI bus.
- CVE-2025-14858Medium
Semtech LR11xx LoRa transceivers with early firmware versions have an information disclosure vulnerability in firmware validation. After a firmware validity check command via SPI, the last decrypted block remains in memory, allowing an attacker with SPI access to read the decrypted firmware.
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS