What is CVE-2025-15645?

CVE-2025-15645 is a medium-severity vulnerability in Ledger Flex, classified under Improper Validation of Specified Quantity in Input. CVSS score: 4.6/10. Published 2026-05-19.

How severe is CVE-2025-15645?

Medium severity. CVSS v3 base score is 4.6 out of 10.

Vulnerability in Ledger Flex

CVE-2025-15645

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_h…

EPSS: 0.000 (6.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Ledger Flex — versions 0
Ledger Nano X — versions 0
Ledger Stax — versions 0

Weakness classification (CWE)

CWE-1284 — Improper Validation of Specified Quantity in Input

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)
disclosure@vulncheck.com (vendor-advisory)

Frequently asked questions

What is CVE-2025-15645?: CVE-2025-15645 is a medium-severity vulnerability in Ledger Flex, classified under Improper Validation of Specified Quantity in Input. CVSS score: 4.6/10. Published 2026-05-19.
How severe is CVE-2025-15645?: Medium severity. CVSS v3 base score is 4.6 out of 10.