CVE-2019-5421

Name: CVE-2019-5421
Creator: NVD / NIST
Published: 2019-04-03T15:29:01.663+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.56%

Last modified Jun 17, 2026

CVE-2019-5421 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 1.56% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.56%

72.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Plataformatec	Devise	<= 4.5.0

References

https://github.com/plataformatec/devise/issues/4981Exploit, Issue Tracking, Third Party Advisory
https://github.com/plataformatec/devise/pull/4996Patch, Third Party Advisory
https://github.com/plataformatec/devise/issues/4981Exploit, Issue Tracking, Third Party Advisory
https://github.com/plataformatec/devise/pull/4996Patch, Third Party Advisory

Timeline

Published: Apr 3, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-5421?

How severe is CVE-2019-5421?

CVE-2019-5421 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.56% probability of exploitation in the next 30 days.

How do I fix CVE-2019-5421?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-5421?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST