How severe is CVE-2024-45678?

CVE-2024-45678 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over physical access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2024-45678 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-45678?

CVE-2024-45678 primarily affects Yubico Yubikey 5c Nfc Firmware. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-45678?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-45678 have an EU (EUVD) identifier?

Yes. CVE-2024-45678 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-41550.

When was CVE-2024-45678 published?

CVE-2024-45678 was published on 2024-09-03 and last updated on 2026-06-17.

CVE-2024-45678

CVE-2024-45678 is a medium-severity vulnerability in Yubico Yubikey 5c Nfc Firmware with a CVSS 3.x base score of 4.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-203.

Key facts

Severity: Medium (CVSS 3.x base score 4.2)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-41550
Weakness: CWE-203
Affected product: Yubico Yubikey 5c Nfc Firmware
Published: 2024-09-03
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2024-45678?: 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.
How severe is CVE-2024-45678?: CVE-2024-45678 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over physical access with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2024-45678 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-45678?: CVE-2024-45678 primarily affects Yubico Yubikey 5c Nfc Firmware. In total, 18 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-45678?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-45678 have an EU (EUVD) identifier?: Yes. CVE-2024-45678 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-41550.
When was CVE-2024-45678 published?: CVE-2024-45678 was published on 2024-09-03 and last updated on 2026-06-17.

References

Affected products (18)

cpe:2.3:o:yubico:yubikey_5c_nfc_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yubico:yubikey_5_nfc_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yubico:yubikey_5c_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yubico:yubikey_5_nano_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yubico:yubikey_5c_nano_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yubico:yubikey_5ci_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yubico:yubikey_5_nfc_fips_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yubico:yubikey_5c_nfc_fips_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yubico:yubikey_5c_fips_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yubico:yubikey_5_nano_fips_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yubico:yubikey_5c_nano_fips_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yubico:yubikey_5ci_fips_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yubico:yubikey_c_bio_firmware:*:*:*:*:fido:*:*:*
cpe:2.3:o:yubico:yubikey_bio_firmware:*:*:*:*:fido:*:*:*
cpe:2.3:o:yubico:security_key_nfc_by_yubico_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yubico:security_key_c_nfc_by_yubico_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yubico:yubihsm_2_fips_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:yubico:yubihsm_2_firmware:*:*:*:*:*:*:*:*

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