---
id: CVE-2025-14857
title: >-
  An improper access control vulnerability exists in Semtech LoRa LR11xxx
  transceivers running early versions of firmware where the memory write command
  accessible via the physical SPI interface fails to enforce write protection on
  the pro…
summary: >-
  An improper access control vulnerability exists in Semtech LoRa LR11xxx
  transceivers running early versions of firmware where the memory write command
  accessible via the physical SPI interface fails to enforce write protection on
  the pro…
severity: none
cwe:
  - CWE-123
published: '2026-04-07'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-14857'
references:
  - url: >-
      https://www.semtech.com/company/security/security-bulletins/sem-psa-2026-001
    label: security@sierrawireless.com
tags:
  - nvd
  - exploit-available
epss: 0.00243
epssPercentile: 0.13872
ingestedAt: '2026-07-25T23:05:57.518Z'
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/Ermensonx/CVE-2025-14857-MongoBleed'
  checkedAt: '2026-09-26T09:05:35.691Z'
exploitAvailable: true
---

## Overview

An improper access control vulnerability exists in Semtech LoRa LR11xxx transceivers running early versions of firmware where the memory write command accessible via the physical SPI interface fails to enforce write protection on the program call stack. An attacker with physical access to the SPI interface can overwrite stack memory to hijack program control flow and achieve limited arbitrary code execution. However, the impact is limited to the active attack session: the device's secure boot mechanism prevents persistent firmware modification, the crypto engine isolates cryptographic keys from direct firmware access, and all modifications are lost upon device reboot or loss of physical access.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.