CVE intelligence and bounded remediation

CVE-2024-45678 — Yubico Yubikey 5C Nfc Firmware security vulnerability

Medium CVSS 4.2

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.

Severity
Medium
CVSS
4.2 (3.1)
Published
2024-09-03
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-203

Affected products

  • yubico / yubikey_5c_nfc_firmware
  • yubico / yubikey_5_nfc_firmware
  • yubico / yubikey_5c_firmware
  • yubico / yubikey_5_nano_firmware
  • yubico / yubikey_5c_nano_firmware
  • yubico / yubikey_5ci_firmware

Showing 6 representative product identities from 18 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Information disclosure and sensitive data exposure

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Trace sensitive data through responses, errors, logs, metrics, traces, caches, exports, files, backups, and client bundles.
  • Identify affected subjects, tenants, retention windows, access controls, and downstream copies without opening unnecessary sensitive records.
  • Review metadata, timing, status, length, and existence signals as well as direct content disclosure.

Remediate safely

  • Minimize collection and output, apply field-level authorization and redaction at a centralized boundary, and return generic external errors.
  • Remove secrets and sensitive data from logs, artifacts, URLs, caches, and client-side bundles; rotate credentials that may have been exposed.
  • Update the affected component and add synthetic-data tests for response, error, observability, and export paths.

Authoritative sources

Complete CVE record and remediation plan

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