CVE-2025-15645: CWE-1284 Improper Validation of Specified Quantity in Input in Ledger Ledger Nano X
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.
AI Analysis
Technical Summary
CVE-2025-15645 describes a denial of service vulnerability affecting Ledger Nano X, Flex, and Stax devices. The vulnerability is due to improper validation of the reset_handler parameter in the MCU firmware update process. By providing a malicious reset_handler address during firmware flashing, an attacker can cause the device to crash irrecoverably during boot, rendering it permanently inoperable. This vulnerability does not impact confidentiality or integrity but results in a high availability impact. There is no vendor advisory or patch information available at this time.
Potential Impact
The vulnerability leads to a denial of service condition causing permanent loss of device operability. There is no impact on confidentiality or integrity of data stored on the device. The device becomes unusable after a malicious firmware flashing attempt exploiting this flaw.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should avoid applying untrusted firmware updates and only use firmware provided directly by Ledger through official channels.
CVE-2025-15645: CWE-1284 Improper Validation of Specified Quantity in Input in Ledger Ledger Nano X
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.
CVSS v3.1
Score 4.6medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2025-15645 describes a denial of service vulnerability affecting Ledger Nano X, Flex, and Stax devices. The vulnerability is due to improper validation of the reset_handler parameter in the MCU firmware update process. By providing a malicious reset_handler address during firmware flashing, an attacker can cause the device to crash irrecoverably during boot, rendering it permanently inoperable. This vulnerability does not impact confidentiality or integrity but results in a high availability impact. There is no vendor advisory or patch information available at this time.
Potential Impact
The vulnerability leads to a denial of service condition causing permanent loss of device operability. There is no impact on confidentiality or integrity of data stored on the device. The device becomes unusable after a malicious firmware flashing attempt exploiting this flaw.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should avoid applying untrusted firmware updates and only use firmware provided directly by Ledger through official channels.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-05-19T21:28:04.419Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a0cde35ba1db47362f22f46
Added to database: 05/19/2026, 22:03:33 UTC
Last enriched: 07/15/2026, 09:49:29 UTC
Last updated: 07/31/2026, 19:22:53 UTC
Views: 107
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