{"id":"CVE-2025-14859","aliases":["EUVD-2025-209287","GHSA-v47h-jj44-7gh5"],"status":"published","title":"Semtech LR11xx Secure Boot Bypass","description":"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.","severity":{"version":"4.0","score":7,"vector":"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/AU:N/R:I/V:C/RE:M","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00114,"percentile":0.01476,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-327"],"published":"2026-04-07T19:58:41Z","modified":"2026-07-24T23:10:00Z","products":[{"vendor":"semtech","product":"lr1110"},{"vendor":"semtech","product":"lr1120"},{"vendor":"semtech","product":"lr1121"}],"references":[{"url":"https://www.semtech.com/company/security/security-bulletins/sem-psa-2026-001"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-14859"},{"url":"https://github.com/advisories/GHSA-v47h-jj44-7gh5"}],"sources":{"cve":[{"id":"CVE-2025-14859","title":"Semtech LR11xx Secure Boot Bypass","description":"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.","status":"published","published":"2026-04-07T19:58:41.379Z","modified":"2026-04-07T20:42:41.142Z","cvss":[{"version":"4.0","score":7,"vector":"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/AU:N/R:I/V:C/RE:M","level":"high","assessor":"cna"}],"cwes":["CWE-327"],"updated_at":"2026-11-02T14:32:28.250136Z"}],"euvd":[{"id":"EUVD-2025-209287","description":"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.","status":"published","published":"2026-04-07T19:58:41Z","modified":"2026-04-07T20:42:41Z","cvss":[{"version":"4.0","score":7,"vector":"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/AU:N/R:I/V:C/RE:M","level":"high"}],"updated_at":"2026-11-02T19:25:12.431163Z"}],"ghsa":[{"id":"GHSA-v47h-jj44-7gh5","title":"The Semtech LR11xx LoRa transceivers implement secure boot functionality using digital signatures...","description":"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.","status":"published","published":"2026-04-07T21:32:39Z","modified":"2026-04-07T21:32:46Z","cvss":[{"version":"4.0","score":7,"vector":"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/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:I/V:C/RE:M/U:X","level":"high"}],"cwes":["CWE-327"],"updated_at":"2026-11-02T15:07:11.605224Z"}],"nvd":[{"id":"CVE-2025-14859","description":"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.","status":"published","published":"2026-04-07T20:16:22.59Z","modified":"2026-07-24T23:10:00.563Z","cvss":[{"version":"4.0","score":7,"vector":"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/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:I/V:C/RE:M/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-327"],"updated_at":"2026-11-02T14:12:01.641503Z"}]}}