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Description

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.

PUBLISHED Reserved 2025-12-18 | Published 2026-04-07 | Updated 2026-04-07 | Assigner SWI




MEDIUM: 5.1CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/AU:N/R:A/V:C/RE:M

Problem types

CWE-226 Sensitive Information in Resource Not Removed Before Reuse

Product status

Default status
unaffected

Any version before TRX FW 0x0402
affected

Default status
unaffected

Any version before TRX FW 0x0202
affected

Default status
unaffected

Any version before TRX FW 0x0104
affected

Credits

Egor (radioegor146) Koleda, https://github.com/radioegor146 finder

References

www.semtech.com/...urity/security-bulletins/sem-psa-2026-001

cve.org (CVE-2025-14858)

nvd.nist.gov (CVE-2025-14858)

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