CVE-2025-14859

HighCVSS 7.0/10Last modified Jul 24, 2026

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.

Metrics

CVSS 4.0 7.0/10

CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:I/V:C/RE:M/U:X

Weakness enumeration

CWE-327

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
Semtech	LR1110	< BL2 FW 0x1001
Semtech	LR1120	< BL2 FW 0x2001
Semtech	LR1121	< BL2 FW 0x2101

References

https://www.semtech.com/company/security/security-bulletins/sem-psa-2026-001

Timeline

Published: Apr 7, 2026
Last modified: Jul 24, 2026
NVD status: Awaiting Analysis

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