CVE-2025-14857

Physical code execution via unprotected stack writes

Published Apr 7, 2026 · Updated Apr 7, 2026

Improper access control in Semtech LR1110, LR1120, and LR1121 firmware allows physically proximate attackers to execute code via SPI. The SPI memory-write command accepts writes to the program call stack without enforcing protected ranges, enabling control-flow hijacking. Exploitation requires physical SPI access; secure boot blocks persistence, the crypto engine isolates keys, and reboot clears the modification.

CVSS severity5.4
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Semtech LR1110, LR1120, and LR1121 firmware allows physically proximate attackers to execute code via SPI. The SPI memory-write command accepts writes to the program call stack without enforcing protected ranges, enabling control-flow hijacking. Exploitation requires physical SPI access; secure boot blocks persistence, the crypto engine isolates keys, and reboot clears the modification.

The record

CVE
CVE-2025-14857
Published
Apr 7, 2026
Updated
Apr 7, 2026
Vendor
Semtech
Product
LR1110
Classifications
CWE-123, CAPEC-679
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 <TRX FW 0x0402

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

Semtech · LR1110version=0 <TRX FW 0x0402
Semtech · LR1120version=0 <TRX FW 0x0202
Semtech · LR1121version=0 <TRX FW 0x0104

Published CVSS scores

5.4SemtechCVSS:4.0/AV:P/AC:L/AT:P/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-123Write-what-where Condition
CAPEC-679Exploitation of Improperly Configured or Implemented Memory Protections

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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