Semtech LR11xx Memory Write Access Control Bypass

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Summary

CVECVE-2025-14857
StatePUBLISHED
AssignerSWI
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-07 20:16:21 UTC
Updated2026-04-08 21:27:00 UTC
DescriptionAn improper access control vulnerability exists in Semtech LoRa LR11xxx transceivers running early versions of firmware where the memory write command accessible via the physical SPI interface fails to enforce write protection on the program call stack. An attacker with physical access to the SPI interface can overwrite stack memory to hijack program control flow and achieve limited arbitrary code execution. However, the impact is limited to the active attack session: the device's secure boot mechanism prevents persistent firmware modification, the crypto engine isolates cryptographic keys from direct firmware access, and all modifications are lost upon device reboot or loss of physical access.

Risk And Classification

Primary CVSS: v4.0 5.4 MEDIUM from [email protected]

CVSS:4.0/AV:P/AC:L/AT:P/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:A/V:D/RE:M/U:X

EPSS: 0.000250000 probability, percentile 0.070560000 (date 2026-04-13)

Problem Types: CWE-123 | CWE-123 CWE-123 Write-what-where Condition

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary5.4MEDIUMCVSS:4.0/AV:P/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:X/C...
4.0CNACVSS5.4MEDIUMCVSS:4.0/AV:P/AC:L/AT:P/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
Present
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:P/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:A/V:D/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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