CVE-2021-43177: Tinfoilsecurity Devise-Two-Factor

Medium severity, CVSS 5.3. EPSS: 0.9% chance of exploitation in the next 30 days.

As a result of an incomplete fix for CVE-2015-7225, in versions of devise-two-factor prior to 4.0.2 it is possible to reuse a One-Time-Password (OTP) for one (and only one) immediately trailing interval. CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N)

Affected products

• Tinfoilsecurity Devise-Two-Factor: before 4.0.2 (fixed in 4.0.2)

Published 2022-04-11. Last modified 2026-06-17.