CVE-2025-15645
Ledger Nano X, Flex, Stax MCU Firmware Update Denial of Service
- State
- Published
- Severity
- 5.1 Medium
- Published
- May 19, 2026
- Updated
- Jul 14, 2026
- Reserved
- May 19, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | 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 | VulnCheck |
| 3.1 | 4.6 Medium | CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-1284 Improper Validation of Specified Quantity in Input
Affected Products
| Product | Versions |
|---|---|
Ledger Nano XLedger |
|
Ledger FlexLedger |
|
Ledger StaxLedger |
|
References
- Ledger Security Bulletin 021vendor-advisory
- https://www.vulncheck.com/advisories/ledger-nano-x-flex-stax-mcu-firmware-update-denial-of-servicethird-party-advisory
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