CVE-2025-14859

Unauthorized firmware installation via collision-prone boot hash

Published Apr 7, 2026 · Updated Apr 7, 2026

Secure-boot bypass in Semtech LR1110, LR1120, and LR1121 firmware allows physically proximate attackers to install unauthorized firmware. The bootloader authenticates firmware with a non-standard hash that permits a second-preimage collision to pass digital-signature verification. Physical device access is required; a forged image can replace trusted firmware with attacker-controlled code.

CVSS severity7.0
High
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Secure-boot bypass in Semtech LR1110, LR1120, and LR1121 firmware allows physically proximate attackers to install unauthorized firmware. The bootloader authenticates firmware with a non-standard hash that permits a second-preimage collision to pass digital-signature verification. Physical device access is required; a forged image can replace trusted firmware with attacker-controlled code.

The record

CVE
CVE-2025-14859
Published
Apr 7, 2026
Updated
Apr 7, 2026
Vendor
Semtech
Product
LR1110
Classifications
CWE-327, CAPEC-68, T1542.001
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <BL2 FW 0x1001

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Semtech · LR1110version=0 <BL2 FW 0x1001
Semtech · LR1120version=0 <BL2 FW 0x2001
Semtech · LR1121version=0 <BL2 FW 0x2101

Published CVSS scores

7.0Sierra Wireless Inc.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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-327Use of a Broken or Risky Cryptographic Algorithm
CAPEC-68Subvert Code-signing
T1542.001Pre-OS Boot: System Firmware

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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