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.
History

Wed, 20 May 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Wed, 20 May 2026 14:30:00 +0000

Type Values Removed Values Added
References

Wed, 20 May 2026 14:15:00 +0000

Type Values Removed Values Added
References

Wed, 20 May 2026 11:45:00 +0000

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

Tue, 19 May 2026 22:00:00 +0000

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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-05-19T21:41:50.473Z

Updated: 2026-05-20T14:45:40.508Z

Reserved: 2026-05-19T21:28:04.419Z

Link: CVE-2025-15645

cve-icon Vulnrichment

Updated: 2026-05-20T14:43:55.897Z

cve-icon NVD

Status : Deferred

Published: 2026-05-19T22:16:36.187

Modified: 2026-05-20T14:16:36.080

Link: CVE-2025-15645

cve-icon Redhat

No data.