CVE-2021-21288

mediumpriority · track · 17EPSS 0.012 · 67 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.17% (67th) EPSS

CVSS 4 · medium

Is it mine?

6 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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.

cvss

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

4.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.04mediumAV:N/AC:L/Au:S/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 8 · impact 2.9

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 1.4

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · ENISA EU

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · security-advisories@github.comexploitability 2.8 · impact 1.4

v3.14.3mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:Nsecondary · OSV

v3.14mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-918USCWE-918US

affected products (6)

Products and version ranges known to be affected.

carrierwaveuploader carrierwave≤ < 1.3.2enisa_euvdEU
carrierwaveuploader carrierwave2.0.0, → 2.1.1enisa_euvdEU
carrierwave project carrierwave< 1.3.2nvdUScpe:2.3:a:carrierwave_project:carrierwave:*:*:*:*:*:*:*:*
carrierwave project carrierwave2.0.1 → 2.1.1nvdUScpe:2.3:a:carrierwave_project:carrierwave:*:*:*:*:*:*:*:*
RubyGems carrierwave< 1.3.2osvUSpkg:gem/carrierwave
RubyGems carrierwave2.0.0 → 2.1.1osvUSpkg:gem/carrierwave

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-fwcm-636p-68r5Server-side request forgery in CarrierWave2021-02-08ghsa · osvUS
### Impact [CarrierWave download feature](https://github.com/carrierwaveuploader/carrierwave#uploading-files-from-a-remote-location) 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. ### Patches Upgrade to [2.1.1](https://rubygems.org/gems/carrierwave/versions/2.1.1) or [1.3.2](https://rubygems.org/gems/carrierwave/versions/1.3.2). ### Workarounds Using proper network segmentation and applying the principle of least privilege to outbound connections from application servers can reduce the severity of SSRF vulnerabilities. Ideally the vulnerable gem should run on an isolated server without access to any internal network resources or cloud metadata access. ### References [Server-Side Request Forgery Prevention Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/Server_Side_Request_Forgery_Prevention_Cheat_Sheet.html) ### For more information If you have any questions or comments about this advisory: * Open an issue in [CarrierWave repo](https://github.com/carrierwaveuploader/carrierwave) * Email me at [mit.shibuya@gmail.com](mailto:mit.shibuya@gmail.com)

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 2021-02-08modified 2026-06-17

references (16)

External citations — patches, advisories, analysis.

scry

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