CVE-2025-14858 Semtech CVE debrief

Who should care

Organizations using Semtech LR11xx LoRa transceivers, especially those in industries relying on secure firmware updates and data protection, should be aware of this vulnerability. The vulnerability requires physical access to the device's SPI interface, but it could still pose a significant risk to systems using these transceivers.

Technical summary

The Semtech LR11xx LoRa transceivers contain an information disclosure vulnerability in their firmware validation functionality. When a host issues a firmware validity check command via the SPI interface, the device decrypts the provided encrypted firmware package block-by-block to validate its integrity. However, the last decrypted firmware block remains uncleared in memory after the validation process completes. An attacker with access to the SPI interface can subsequently issue memory read commands to retrieve the decrypted firmware contents from this residual memory, effectively bypassing the firmware encryption protection mechanism. The attack requires physical access to the device's SPI interface.

Defensive priority

Medium priority due to the requirement for physical access to the SPI interface, but still significant for organizations using these transceivers in secure environments.

Recommended defensive actions

• Update to the latest firmware version for Semtech LR11xx LoRa transceivers
• Implement physical security measures to restrict access to the SPI interface
• Monitor for and respond to potential unauthorized access attempts
• Consider using additional encryption or access controls for sensitive data
• Review and update incident response plans to address potential exploitation

Evidence notes

The CVE record was published on 2026-04-07T20:16:22.397Z and was last modified on 2026-07-24T23:10:00.563Z. The NVD entry is currently Awaiting Analysis. Semtech has a security bulletin (SEM-PSA-2026-001) addressing this issue.

Official resources