CVE-2019-5421

highpriority · track · 40EPSS 0.016 · 75 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.56% (75th) EPSS

CVSS 7.5 · high

Is it mine?

3 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

Plataformatec Devise version 4.5.0 and earlier, using the lockable module contains a CWE-367 vulnerability in The `Devise::Models::Lockable` class, more specifically at the `#increment_failed_attempts` method. File location: lib/devise/models/lockable.rb that can result in Multiple concurrent requests can prevent an attacker from being blocked on brute force attacks. This attack appear to be exploitable via Network connectivity - brute force attacks. This vulnerability appears to have been fixed in 4.6.0 and later.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-307USprimaryCWE-367USCWE-367US

affected products (3)

Products and version ranges known to be affected.

Plataformatec Devise ruby gem≤ 4.5.0 and earlier using the lockable moduleenisa_euvdEU
plataformatec devise≤ 4.5.0nvdUScpe:2.3:a:plataformatec:devise:*:*:*:*:*:*:*:*
RubyGems devise< 4.6.0osvUSpkg:gem/devise

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-73rf-6mrf-759qdevise Time-of-check Time-of-use Race Condition vulnerability2019-03-19ghsa · osvUS
Devise ruby gem before 4.6.0 when the `lockable` module is used is vulnerable to a time-of-check time-of-use (TOCTOU) race condition due to `increment_failed_attempts` within the `Devise::Models::Lockable` class not being concurrency safe.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2019-04-03modified 2026-06-17

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+820 more

references (7)

External citations — patches, advisories, analysis.

https://github.com/plataformatec/devise/issues/4981 cnnvd
https://github.com/plataformatec/devise/pull/4996 cnnvd
https://nvd.nist.gov/vuln/detail/CVE-2019-5421 cnnvd
https://github.com/plataformatec/devise/issues/4981 enisa_euvd
https://github.com/plataformatec/devise/pull/4996 enisa_euvd
https://github.com/plataformatec/devise/issues/4981ExploitIssue TrackingThird Party Advisorynvd
https://github.com/plataformatec/devise/pull/4996PatchThird Party Advisorynvd

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