Semtech LR11xx Encrypted Firmware Disclosure

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Summary

CVECVE-2025-14858
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 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.

Risk And Classification

Primary CVSS: v4.0 5.1 MEDIUM from [email protected]

CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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:A/V:C/RE:M/U:X

EPSS: 0.000140000 probability, percentile 0.024850000 (date 2026-04-13)

Problem Types: CWE-226 | CWE-226 CWE-226 Sensitive Information in Resource Not Removed Before Reuse

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary5.1MEDIUMCVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS5.1MEDIUMCVSS: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/...

CVSS v4.0 Breakdown

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

CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/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:A/V:C/RE:M/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Semtech LR1110 affected TRX FW 0x0402 custom Not specified
CNA Semtech LR1120 affected TRX FW 0x0202 custom Not specified
CNA Semtech LR1121 affected TRX FW 0x0104 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
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

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

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