Vulnerability in Yubico Security Key C Nfc By
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (23.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.yubico.com/support/security-advisories/ysa-2024-03/ (Vendor Advisory)
- support.yubico.com/hc/en-us/articles/15705749884444 (Third Party Advisory, Mitigation)
- ninjalab.io/eucleak/ (Third Party Advisory)
- ninjalab.io/wp-content/uploads/2024/09/20240903_eucleak.pdf (Technical Description)
- news.ycombinator.com/item (Issue Tracking)
- arstechnica.com/security/2024/09/yubikeys-are-vulnerable-to-cloning-attacks-tha… (Press/Media Coverage)
Frequently asked questions
- What is CVE-2024-45678?
- CVE-2024-45678 is a medium-severity vulnerability in Yubico Security Key C Nfc By, classified under Observable Discrepancy. CVSS score: 4.2/10. Published 2024-09-03.
- How severe is CVE-2024-45678?
- Medium severity. CVSS v3 base score is 4.2 out of 10.
- Is CVE-2024-45678 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.