What’s Vulnerable › Vulnerabilities

CVE-2020-14199

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-06-16 · updated 2026-06-17
• Weakness: CWE-347

Description

BIP-143 in the Bitcoin protocol specification mishandles the signing of a Segwit transaction, which allows attackers to trick a user into making two signatures in certain cases, potentially leading to a huge transaction fee. NOTE: this affects all hardware wallets. It was fixed in 1.9.1 for the Trezor One and 2.3.1 for the Trezor Model T.

Affected products

• Satoshilabs Trezor Model T Firmware: before 2.3.1 — fixed in 2.3.1
• Satoshilabs Trezor One Firmware: before 1.9.1 — fixed in 1.9.1

How to fix

Upgrade to a fixed version: Satoshilabs Trezor Model T Firmware 2.3.1; Satoshilabs Trezor One Firmware 1.9.1. Check the vendor advisory for mitigations.

References

• https://blog.trezor.io/details-of-firmware-updates-for-trezor-one-version-1-9-1-and-trezor-model-t-version-2-3-1-1eba8f60f2dd
• https://blog.trezor.io/details-of-firmware-updates-for-trezor-one-version-1-9-1-and-trezor-model-t-version-2-3-1-1eba8f60f2dd

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