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CVE-2025-14858 Semtech CVE debrief

CVE-2025-14858 is an information disclosure vulnerability in Semtech LR11xx LoRa transceivers running early firmware versions. The vulnerability occurs in the firmware validation functionality, where the device decrypts provided encrypted firmware packages block-by-block to validate integrity. However, the last decrypted firmware block remains uncleared in memory after validation completes. An attacker with access to the SPI interface can issue memory read commands to retrieve decrypted firmware contents from residual memory, bypassing firmware encryption protection.

Vendor
Semtech
Product
LR1110
CVSS
MEDIUM 5.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-07
Original CVE updated
2026-07-24
Advisory published
2026-04-07
Advisory updated
2026-07-24

Who should care

Organizations using Semtech LR11xx LoRa transceivers, especially those in industries relying on secure firmware updates and data protection, should be aware of this vulnerability. The vulnerability requires physical access to the device's SPI interface, but it could still pose a significant risk to systems using these transceivers.

Technical summary

The Semtech LR11xx LoRa transceivers contain an information disclosure vulnerability in their 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.

Defensive priority

Medium priority due to the requirement for physical access to the SPI interface, but still significant for organizations using these transceivers in secure environments.

Recommended defensive actions

  • Update to the latest firmware version for Semtech LR11xx LoRa transceivers
  • Implement physical security measures to restrict access to the SPI interface
  • Monitor for and respond to potential unauthorized access attempts
  • Consider using additional encryption or access controls for sensitive data
  • Review and update incident response plans to address potential exploitation

Evidence notes

The CVE record was published on 2026-04-07T20:16:22.397Z and was last modified on 2026-07-24T23:10:00.563Z. The NVD entry is currently Awaiting Analysis. Semtech has a security bulletin (SEM-PSA-2026-001) addressing this issue.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-14858 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-14858

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2025-14858 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-14858

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.