CVE-2025-15645

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

Published May 19, 2026 CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Ledger-cli
Ledger-cli ledger
CPEs cpe:2.3:a:ledger-cli:ledger:*:*:*:*:*:*:*:*
Vendors & Products Ledger-cli
Ledger-cli ledger
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Ledger
Ledger flex
Ledger nano X
Ledger stax
Vendors & Products Ledger
Ledger flex
Ledger nano X
Ledger stax
Type Values Removed Values Added
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.
Title Ledger Nano X, Flex, Stax MCU Firmware Update Denial of Service
Weaknesses CWE-1284
References
Metrics cvssV3_1

{'score': 4.6, 'vector': 'CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Jul 14, 2026, 10:25 PM
Reserved
May 19, 2026, 9:28 PM
Status
Deferred
Published
May 19, 2026, 10:16 PM
Modified
Jul 24, 2026, 9:10 AM