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Fencer Intel
medium 4.2

CVE-2024-45678 json

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 extra…

published 2y ago modified 4mo ago also EUVD-2024-41550

cvss
4.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits
0
none known

Summary

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.

Patch / fix

  • 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

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2y ago

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CISA ADP 3.1 4.2 CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 3.1 4.2 CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 4.2 CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.