CVE-2020-14199

Name: CVE-2020-14199
Creator: NVD / NIST
Published: 2020-06-16T18:15:17.137+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.85%

Last modified Jun 17, 2026

CVE-2020-14199 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.85% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

EPSS Probability

0.85%

53.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
Satoshilabs	Trezor Model T Firmware	< 2.3.1
Satoshilabs	Trezor One Firmware	< 1.9.1

References

Timeline

Published: Jun 16, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-14199?

How severe is CVE-2020-14199?

CVE-2020-14199 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.85% probability of exploitation in the next 30 days.

How do I fix CVE-2020-14199?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-14199?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST