CVE-2025-14859

Semtech LR11xx Secure Boot Bypass

State: Published
Severity: 7.0 High
Published: Apr 7, 2026
Updated: Apr 7, 2026
Reserved: Dec 18, 2025

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.

Scores

CVSS	Score	Vector	Source
4.0	7.0 High	CVSS: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	SWI

Weaknesses

CWE-327 Use of a Broken or Risky Cryptographic Algorithm

Affected Products

Product	Versions
LR1110Semtech	before BL2 FW 0x1001Affected
LR1120Semtech	before BL2 FW 0x2001Affected
LR1121Semtech	before BL2 FW 0x2101Affected

References

https://www.semtech.com/company/security/security-bulletins/sem-psa-2026-001

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