CVE-2025-14859
High
Description
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.
SeverityHigh
CVSS7.0
Exploit probability—
ProductLR1110
PublishedApr 7, 2026
First seenApr 7, 2026
Weakness typeCWE-327CWE-327
How to fix
Update
- Semtech LR1110BL2 FW 0x1001 or later
- Semtech LR1120BL2 FW 0x2001 or later
- Semtech LR1121BL2 FW 0x2101 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Semtech LR1110 | v < BL2 FW 0x1001 | BL2 FW 0x1001 |
| Semtech LR1120 | v < BL2 FW 0x2001 | BL2 FW 0x2001 |
| Semtech LR1121 | v < BL2 FW 0x2101 | BL2 FW 0x2101 |
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