CVE-2024-45678

Name: CVE-2024-45678
Creator: NVD / NIST
Published: 2024-09-03T20:15:08.86+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.2/10EPSS 0.33%

Last modified Jun 17, 2026

CVE-2024-45678 is a medium-severity vulnerability rated 4.2/10 on the CVSS scale. Yubico YubiKey 5 Series devices with firmware before 5.7.0 and YubiHSM 2 devices with firmware before 2.4.0 allow an ECDSA secret-key extraction attack (that requires physical access and expensive equipment) in which an electromagnetic side channel is present because of a non-constant-time modular inversion for the Extended Euclidean Algorithm, aka the EUCLEAK issue. Other uses of an Infineon cryptographic library may also be affected.. EPSS estimates a 0.33% chance of exploitation in the next 30 days.

Description

Yubico YubiKey 5 Series devices with firmware before 5.7.0 and YubiHSM 2 devices with firmware before 2.4.0 allow an ECDSA secret-key extraction attack (that requires physical access and expensive equipment) in which an electromagnetic side channel is present because of a non-constant-time modular inversion for the Extended Euclidean Algorithm, aka the EUCLEAK issue. Other uses of an Infineon cryptographic library may also be affected.

Metrics

CVSS 3.1

4.2/10

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

EPSS Probability

0.33%

24.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Yubico	Yubikey 5c Nfc Firmware	< 5.7
Yubico	Yubikey 5 Nfc Firmware	< 5.7
Yubico	Yubikey 5c Firmware	< 5.7
Yubico	Yubikey 5 Nano Firmware	< 5.7
Yubico	Yubikey 5c Nano Firmware	< 5.7
Yubico	Yubikey 5ci Firmware	< 5.7
Yubico	Yubikey 5 Nfc Fips Firmware	< 5.7
Yubico	Yubikey 5c Nfc Fips Firmware	< 5.7
Yubico	Yubikey 5c Fips Firmware	< 5.7
Yubico	Yubikey 5 Nano Fips Firmware	< 5.7
Yubico	Yubikey 5c Nano Fips Firmware	< 5.7
Yubico	Yubikey 5ci Fips Firmware	< 5.7
Yubico	Yubikey C Bio Firmware	< 5.7.2
Yubico	Yubikey Bio Firmware	< 5.7.2
Yubico	Security Key Nfc By Yubico Firmware	< 5.7
Yubico	Security Key C Nfc By Yubico Firmware	< 5.7
Yubico	Yubihsm 2 Fips Firmware	< 2.4.0
Yubico	Yubihsm 2 Firmware	< 2.4.0

References

https://arstechnica.com/security/2024/09/yubikeys-are-vulnerable-to-cloning-attacks-thanks-to-newly-discovered-side-channel/Press/Media Coverage
https://news.ycombinator.com/item?id=41434500Issue Tracking
https://ninjalab.io/eucleak/Third Party Advisory
https://ninjalab.io/wp-content/uploads/2024/09/20240903_eucleak.pdfTechnical Description
https://support.yubico.com/hc/en-us/articles/15705749884444Mitigation, Third Party Advisory
https://www.yubico.com/support/security-advisories/ysa-2024-03/Vendor Advisory

Timeline

Published: Sep 3, 2024
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2024-45678?

How severe is CVE-2024-45678?

CVE-2024-45678 has a CVSS score of 4.2/10 (MEDIUM severity). The EPSS model estimates a 0.33% probability of exploitation in the next 30 days.

How do I fix CVE-2024-45678?

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-2024-45678?

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

Scan your code now

Source: NVD / NIST