CVE-2021-4250: A vulnerability classified as problematic has been found in cgriego active_attr up to 0.15.2

Q: How do I fix CVE-2021-4250?

active attr: upgrade to 0.15.3. Exact commands for each OS are on this page.

Q: Is CVE-2021-4250 being exploited?

CVE-2021-4250 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-4250 affect?

CVE-2021-4250 affects active attr. Severity is low (CVSS 3.5). A vulnerability classified as problematic has been found in cgriego active_attr up to 0.15.2. This affects the function call of the file lib/active_attr/typecasting/boolean_typecaster.rb of the component Regex Handler. The manipulation of t

Q: How urgent is CVE-2021-4250?

Priority 34/100. Public exploit reference

Routine

LOW 3.5UPGRADE

CVE-2021-4250 is a low-severity flaw (CVSS 3.5) affecting active attr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability classified as problematic has been found in cgriego active_attr up to 0.15.2. This affects the function call of the file lib/active_attr/typecasting/boolean_typecaster.rb of the component Regex Handler. The manipulation of the argument value leads to denial of service. The exploit has been disclosed to the public and may be used. Upgrading to version 0.15.3 is able to address this issue. The name of the patch is dab95e5843b0152544

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.5 (Low)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-404
Published	2022-12-18
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: active attr project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-12-18 22:15 UTCPublished CVE record published
2026-06-17 04:19 UTCUpdated Record last modified

active attr project active attr UPGRADE

Affected: < 0.15.3

Fixed in: 0.15.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy active-attr || rpm -q active-attr || active-attr --version

2. UPGRADE to 0.15.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade active-attr

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade active-attr

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-4250?

active attr: upgrade to 0.15.3. Exact commands for each OS are on this page.

Is CVE-2021-4250 being exploited?

CVE-2021-4250 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-4250 affect?

CVE-2021-4250 affects active attr. Severity is low (CVSS 3.5). A vulnerability classified as problematic has been found in cgriego active_attr up to 0.15.2. This affects the function call of the file lib/active_attr/typecasting/boolean_typecaster.rb of the component Regex Handler. The manipulation of t

How urgent is CVE-2021-4250?

Priority 34/100. Public exploit reference

References

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