Description
An information leak was discovered on Yubico YubiKey 5 NFC devices 5.0.0 to 5.2.6 and 5.3.0 to 5.3.1. The OTP application allows a user to set optional access codes on OTP slots. This access code is intended to prevent unauthorized changes to OTP configurations. The access code is not checked when updating NFC specific components of the OTP configurations. This may allow an attacker to access configured OTPs and passwords stored in slots that were not configured by the user to be read over NFC, despite a user having set an access code. (Users who have not set an access code, or who have not configured the OTP slots, are not impacted by this issue.)
References (1)
Core 1
Core References
Exploit, Mitigation, Vendor Advisory x_refsource_confirm
https://www.yubico.com/support/security-advisories/ysa-2020-04/
Scores
CVSS v3
5.3
EPSS
0.0055
EPSS Percentile
42.1%
Attack Vector
ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Details
CWE
CWE-862
Status
published
Products (1)
yubico/yubikey_5_nfc_firmware
5.0.0 - 5.2.6
Published
Jul 09, 2020
Tracked Since
Feb 18, 2026