Semtech LR11xx Secure Boot Bypass

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Summary

CVECVE-2025-14859
StatePUBLISHED
AssignerSWI
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-07 20:16:22 UTC
Updated2026-04-08 21:27:00 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v4.0 7 HIGH from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:I/V:C/RE:M/U:X

EPSS: 0.000100000 probability, percentile 0.011450000 (date 2026-04-13)

Problem Types: CWE-327 | CWE-327 CWE-327 Use of a Broken or Risky Cryptographic Algorithm

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary7HIGHCVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:X/C...
4.0CNACVSS7HIGHCVSS: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/...

CVSS v4.0 Breakdown

Attack Vector
Physical
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Sub Conf.
Low
Sub Integrity
Low
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:I/V:C/RE:M/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Semtech LR1110 affected BL2 FW 0x1001 custom Not specified
CNA Semtech LR1120 affected BL2 FW 0x2001 custom Not specified
CNA Semtech LR1121 affected BL2 FW 0x2101 custom Not specified

References

ReferenceSourceLinkTags
www.semtech.com/company/security/security-bulletins/sem-psa-2026-001 [email protected] www.semtech.com
CVE Program record CVE.ORG www.cve.org canonical
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