Answer in brief
CVE-2021-21288 records a Medium severity (CVSS 4.3) vulnerability in Server-side request forgery in CarrierWave. The current sources do not mark it as known exploited. The current feed maps carrierwave (rubygems), carrierwave (rubygems). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps carrierwave (rubygems), carrierwave (rubygems). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| carrierwaverubygems | >=0 <1.3.2 | 1.3.2 |
| carrierwaverubygems | >=2.0.0 <2.1.1 | 2.1.1 |
Published upstream
Feb 8, 2021
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Aug 7, 2026
### 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 [[email protected]](mailto:[email protected])
Quoted source text, attributed separately from HOL analysis.