Semtech LR1110/LR1120/LR1121 SPI Interface write-what-where condition

Summaryinfo

A vulnerability classified as problematic has been found in Semtech LR1110, LR1120 and LR1121. This affects an unknown function of the component SPI Interface. Performing a manipulation results in write-what-where condition. This vulnerability is known as CVE-2025-14857. The attack may be carried out on the physical device. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Semtech LR1110, LR1120 and LR1121 (version now known). This affects some unknown processing of the component SPI Interface. The manipulation with an unknown input leads to a write-what-where condition vulnerability. CWE is classifying the issue as CWE-123. Any condition where the attacker has the ability to write an arbitrary value to an arbitrary location, often as the result of a buffer overflow. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was published by Egor as psa-2026-001. It is possible to read the advisory at semtech.com. This vulnerability is uniquely identified as CVE-2025-14857 since 12/18/2025. The exploitability is told to be easy. Attacking locally is a requirement. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available.

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

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Productinfo

Vendor

• Semtech

Name

• LR1110
• LR1120
• LR1121

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