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Description

The Semtech LR11xx LoRa transceivers implement secure boot functionality using digital signatures to authenticate firmware. However, the implementation uses a non-standard cryptographic hashing algorithm that is vulnerable to second preimage attacks. An attacker with physical access to the device can exploit this weakness to generate a malicious firmware image with a hash collision, bypassing the secure boot verification mechanism and installing arbitrary unauthorized firmware on the device.

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




HIGH: 7.0CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/AU:N/R:I/V:C/RE:M

Problem types

CWE-327 Use of a Broken or Risky Cryptographic Algorithm

Product status

Default status
unaffected

Any version before BL2 FW 0x1001
affected

Default status
unaffected

Any version before BL2 FW 0x2001
affected

Default status
unaffected

Any version before BL2 FW 0x2101
affected

References

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

cve.org (CVE-2025-14859)

nvd.nist.gov (CVE-2025-14859)

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