CVE-2025-15645

MEDIUM

Ledger Nano X, Flex, Stax MCU Firmware Update Denial of Service

Title source: cna

Description

Ledger Nano X, Flex, and Stax devices contain a denial of service vulnerability in the MCU firmware update process due to missing validation of the reset_handler parameter during firmware flashing. An attacker can provide a crafted reset_handler address pointing to invalid memory or attacker-controlled code to cause the device to enter an unrecoverable fault state during boot, resulting in permanent loss of operability.

References (3)

Core 3

Core References

Vendor Advisory vendor-advisory

Ledger Security Bulletin 021

https://www.ledger.com/security-bulletin

Third Party Advisory third-party-advisory

https://www.vulncheck.com/advisories/ledger-nano-x-flex-stax-mcu-firmware-update-denial-of-service

Vendor Advisory vendor-advisory

Ledger Security Bulletin 021

https://donjon.ledger.com/lsb/021/

Scores

CVSS v3 4.6

EPSS 0.0021

EPSS Percentile 11.2%

Attack Vector PHYSICAL

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-1284

Status published

Products (3)

Ledger/Ledger Flex < 1.2.2

Ledger/Ledger Nano X < 2.4.2

Ledger/Ledger Stax < 1.6.2

Published May 19, 2026

Tracked Since May 19, 2026