CVE-2021-43177
CVE-2021-43177 is a medium-severity vulnerability in Tinfoilsecurity Devise-two-factor with a CVSS 3.x base score of 5.3. 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-254.
Key facts
- Severity: Medium (CVSS 3.x base score 5.3)
- CVSS v2: 3.5
- EPSS exploit prediction: 1% (54th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-254
- Affected product: Tinfoilsecurity Devise-two-factor
- Published:
- Last modified:
Description
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)
Frequently asked questions
- What is CVE-2021-43177?
- 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)
- How severe is CVE-2021-43177?
- CVE-2021-43177 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
- Is CVE-2021-43177 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-43177?
- CVE-2021-43177 affects Tinfoilsecurity Devise-two-factor. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-43177?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-43177 published?
- CVE-2021-43177 was published on 2022-04-11 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:tinfoilsecurity:devise-two-factor:*:*:*:*:*:*:*:*
More vulnerabilities in Tinfoilsecurity Devise-two-factor
- CVE-2024-8796 — Medium (CVSS 5.3): Under the default configuration, Devise-Two-Factor versions >= 2.2.0 & < 6.0.0 generate TOTP shared secrets that are…
- CVE-2015-7225 — Medium (CVSS 5.3): Tinfoil Devise-two-factor before 2.0.0 does not strictly follow section 5.2 of RFC 6238 and does not "burn" a…
All CVEs affecting Tinfoilsecurity Devise-two-factor →
Other CWE-254 vulnerabilities
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- CVE-2015-3972 — Critical (CVSS 10.0): The web interface on Janitza UMG 508, 509, 511, 604, and 605 devices supports only short PIN values for authentication,…
- CVE-2015-1158 — Critical (CVSS 10.0): The add_job function in scheduler/ipp.c in cupsd in CUPS before 2.0.3 performs incorrect free operations for…
- CVE-2019-15149 — Critical (CVSS 9.8): core.py in Mitogen before 0.2.8 has a typo that drops the unidirectional-routing protection mechanism in the case of a…
- CVE-2017-8227 — Critical (CVSS 9.8): Amcrest IPM-721S V2.420.AC00.16.R.20160909 devices have a timeout policy to wait for 5 minutes in case 30 incorrect…
- CVE-2016-9568 — Critical (CVSS 9.8): A security design issue can allow an unprivileged user to interact with the Carbon Black Sensor and perform…