CVE-2025-14859
Semtech LR11xx Secure Boot Bypass
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.
INFO
Published Date :
April 7, 2026, 8:16 p.m.
Last Modified :
July 24, 2026, 11:10 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2025-14859
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update firmware to use a standard, secure hashing algorithm.
- Implement robust signature verification.
- Validate firmware integrity before execution.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-14859.
| URL | Resource |
|---|---|
| https://www.semtech.com/company/security/security-bulletins/sem-psa-2026-001 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-14859 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-14859
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-14859 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-14859 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 24, 2026
Action Type Old Value New Value Changed Translation Title: LR11xx de Semtech, Description: Los transceptores LoRa Semtech LR11xx implementan la funcionalidad de arranque seguro utilizando firmas digitales para autenticar el firmware. Sin embargo, la implementación utiliza un algoritmo de hash criptográfico no estándar que es vulnerable a ataques de segunda preimagen. Un atacante con acceso físico al dispositivo puede explotar esta debilidad para generar una imagen de firmware maliciosa con una colisión de hash, eludiendo el mecanismo de verificación de arranque seguro e instalando firmware no autorizado arbitrario en el dispositivo. Title: LR11xx de Semtech, Description: Los transceptores LoRa Semtech LR11xx implementan la funcionalidad de arranque seguro utilizando firmas digitales para autenticar el firmware. Sin embargo, la implementación utiliza un algoritmo de hash criptográfico no estándar que es vulnerable a ataques de segunda preimagen. Un atacante con acceso físico al dispositivo puede explotar esta debilidad para generar una imagen de firmware maliciosa con una colisión de hash, eludiendo el mecanismo de verificación de arranque seguro e instalando firmware no autorizado arbitrario en el dispositivo. -
CVE Translated by [email protected]
Jul. 24, 2026
Action Type Old Value New Value Added Translation Title: LR11xx de Semtech, Description: Los transceptores LoRa Semtech LR11xx implementan la funcionalidad de arranque seguro utilizando firmas digitales para autenticar el firmware. Sin embargo, la implementación utiliza un algoritmo de hash criptográfico no estándar que es vulnerable a ataques de segunda preimagen. Un atacante con acceso físico al dispositivo puede explotar esta debilidad para generar una imagen de firmware maliciosa con una colisión de hash, eludiendo el mecanismo de verificación de arranque seguro e instalando firmware no autorizado arbitrario en el dispositivo. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Semtech', 'modules': ['firmware'], 'product': 'LR1110', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': 'BL2 FW 0x1001', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Semtech', 'product': 'LR1120', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': 'BL2 FW 0x2001', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}, {'vendor': 'Semtech', 'product': 'LR1121', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': 'BL2 FW 0x2101', 'versionType': 'custom'}], 'defaultStatus': 'unaffected'}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2025-14859', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-04-07T20:31:39.343091Z'} -
New CVE Received by [email protected]
Apr. 07, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CWE CWE-327 Added Reference https://www.semtech.com/company/security/security-bulletins/sem-psa-2026-001