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TI-2025-13554 Aliases CVE-2025-14859GHSA-v47h-jj44-7gh5

Semtech LR11xx Secure Boot Bypass

Priority LOW 32CWE-327Published · Updated

Key facts

Attack vector
Physical
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-327.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00114 1st percentileScored 2026-11-07
Fix Fixed LR1110 (Semtech): BL2 FW 0x1001LR1120 (Semtech): BL2 FW 0x2001+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
SemtechLR1110before BL2 FW 0x1001BL2 FW 0x1001Patch availableCNA
SemtechLR1120before BL2 FW 0x2001BL2 FW 0x2001Patch availableCNA
SemtechLR1121before BL2 FW 0x2101BL2 FW 0x2101Patch availableCNA
  • LR1110 VendorSemtech Affected before BL2 FW 0x1001 Fixed in BL2 FW 0x1001 Patch available CNA
  • LR1120 VendorSemtech Affected before BL2 FW 0x2001 Fixed in BL2 FW 0x2001 Patch available CNA
  • LR1121 VendorSemtech Affected before BL2 FW 0x2101 Fixed in BL2 FW 0x2101 Patch available CNA

Remediation

  • Fix · CNA LR1110 (Semtech) Fixed in BL2 FW 0x1001
  • Fix · CNA LR1120 (Semtech) Fixed in BL2 FW 0x2001
  • Fix · CNA LR1121 (Semtech) Fixed in BL2 FW 0x2101

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-14859
  2. 2026-10-03 Alias added: GHSA-v47h-jj44-7gh5

References

Other 1

  • TI-2022-18650 Buffer Overflow in `ProcessRadioRxDone` in LoRaMac-node CVSS 3.1CRITICAL 9.8
  • TI-2020-08942 Potential Buffer Overflow in LoRaMac-node CVSS 3.1HIGH 8.8
  • TI-2025-13552 Semtech LR11xx Memory Write Access Control Bypass CVSS 4.0MEDIUM 5.4
  • TI-2026-71207 Out-of-bounds write in Semtech LR11xx transceiver firmware CVSS 4.0MEDIUM 5.2
  • TI-2020-03545 Use After Free in in cups_update_info in LoRa Basics Station CVSS 3.1MEDIUM 5.0
  • TI-2025-13553 Semtech LR11xx Encrypted Firmware Disclosure CVSS 4.0MEDIUM 5.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences