CVE-2021-21288

Name: CVE-2021-21288
Creator: NVD / NIST
Published: 2021-02-08T20:15:12.277+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 1.17%

Last modified Jun 17, 2026

CVE-2021-21288 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. CarrierWave is an open-source RubyGem which provides a simple and flexible way to upload files from Ruby applications. In CarrierWave before versions 1.3.2 and 2.1.1 the download feature has an SSRF vulnerability, allowing attacks to provide DNS entries or IP addresses that are intended for internal use and gather information about the Intranet infrastructure of the platform. EPSS estimates a 1.17% chance of exploitation in the next 30 days.

Description

CarrierWave is an open-source RubyGem which provides a simple and flexible way to upload files from Ruby applications. In CarrierWave before versions 1.3.2 and 2.1.1 the download feature has an SSRF vulnerability, allowing attacks to provide DNS entries or IP addresses that are intended for internal use and gather information about the Intranet infrastructure of the platform. This is fixed in versions 1.3.2 and 2.1.1.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

1.17%

63.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-918

Affected Software

Vendor	Product	Versions
Carrierwave Project	Carrierwave	< 1.3.2
Carrierwave Project	Carrierwave	>= 2.0.1, < 2.1.1

References

https://github.com/carrierwaveuploader/carrierwave/blob/master/CHANGELOG.md#132---2021-02-08Release Notes, Third Party Advisory
https://github.com/carrierwaveuploader/carrierwave/blob/master/CHANGELOG.md#211---2021-02-08Release Notes, Third Party Advisory
https://github.com/carrierwaveuploader/carrierwave/commit/012702eb3ba1663452aa025831caa304d1a665c0Patch, Third Party Advisory
https://github.com/carrierwaveuploader/carrierwave/security/advisories/GHSA-fwcm-636p-68r5Third Party Advisory
https://rubygems.org/gems/carrierwave/Product, Third Party Advisory
https://github.com/carrierwaveuploader/carrierwave/blob/master/CHANGELOG.md#132---2021-02-08Release Notes, Third Party Advisory
https://github.com/carrierwaveuploader/carrierwave/blob/master/CHANGELOG.md#211---2021-02-08Release Notes, Third Party Advisory
https://github.com/carrierwaveuploader/carrierwave/commit/012702eb3ba1663452aa025831caa304d1a665c0Patch, Third Party Advisory
https://github.com/carrierwaveuploader/carrierwave/security/advisories/GHSA-fwcm-636p-68r5Third Party Advisory
https://rubygems.org/gems/carrierwave/Product, Third Party Advisory

Timeline

Published: Feb 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21288?

How severe is CVE-2021-21288?

CVE-2021-21288 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 1.17% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21288?

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-2021-21288?

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

Scan your code now

Source: NVD / NIST