CVE-2025-14859

Severity CVSS v4.0:

HIGH

Type:

CWE-327 Use of a Broken or Risky Cryptographic Algorithm

Publication date:

07/04/2026

Last modified:

08/04/2026

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.

Impact

Vector 4.0

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/AU:N/R:I/V:C/RE:M CVSS v4.0 Severity and Metrics:

Base Score: 7.00 HIGH
Vector: 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/AU:N/R:I/V:C/RE:M

Attack Vector (AV): Physical
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): None
User Interaction (UI): None
Confidentiality (VC): High
Integrity (VI): High
Availability (VA): High
Confidentiality (SC): Low
Integrity (SI): Low
Availability (SA): None
Automatable (AU): No
Recovery (R): Irrecoverable
Value Density (V): Concentrated
Vulnerability Response Effort (RE): Moderate

Base Score 4.0

7.00

Severity 4.0

HIGH

References to Advisories, Solutions, and Tools

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