Semtech LR1110/LR1120/LR1121 SPI Interface sensitive information in resource not removed before reuse

Summaryinfo

A vulnerability identified as problematic has been detected in Semtech LR1110, LR1120 and LR1121. The impacted element is an unknown function of the component SPI Interface. This manipulation causes sensitive information in resource not removed before reuse. This vulnerability is registered as CVE-2025-14858. It is feasible to perform the attack on the physical device. No exploit is available.

Detailsinfo

A vulnerability has been found in Semtech LR1110, LR1120 and LR1121 (affected version not known) and classified as problematic. Affected by this vulnerability is some unknown functionality of the component SPI Interface. The manipulation with an unknown input leads to a sensitive information in resource not removed before reuse vulnerability. The CWE definition for the vulnerability is CWE-226. The product releases a resource such as memory or a file so that it can be made available for reuse, but it does not clear or "zeroize" the information contained in the resource before the product performs a critical state transition or makes the resource available for reuse by other entities. As an impact it is known to affect confidentiality. The summary by CVE is:

The Semtech LR11xx LoRa transceivers running early versions of firmware contains an information disclosure vulnerability in its 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.

The weakness was published by Egor as psa-2026-001. The advisory is shared at semtech.com. This vulnerability is known as CVE-2025-14858 since 12/18/2025. The exploitation appears to be easy. An attack has to be approached locally. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1592 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Semtech

Name

• LR1110
• LR1120
• LR1121

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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