Answer in brief
CVE-2021-25320 records a Critical severity (CVSS 9.9) vulnerability in Rancher cloud credentials can be used through proxy API by users without access. The current sources do not mark it as known exploited. The current feed maps github.com/rancher/rancher (go), github.com/rancher/rancher (go). 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 9.9. 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 github.com/rancher/rancher (go), github.com/rancher/rancher (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| github.com/rancher/ranchergo | >=2.2.0 <2.4.16 | 2.4.16 |
| github.com/rancher/ranchergo | >=2.5.0 <2.5.9 | 2.5.9 |
Published upstream
Mar 3, 2026
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Sep 10, 2026
A vulnerability was discovered in Rancher 2.2.0 through the aforementioned patched versions, where cloud credentials weren't being properly validated through the Rancher API. Specifically through a proxy designed to communicate with cloud providers. Any Rancher user that was logged-in and aware of a cloud-credential ID that was valid for a given cloud provider, could call that cloud provider's API through the proxy API, and the cloud-credential would be attached. The exploit is limited to valid Rancher users. There is not a direct mitigation outside of upgrading to the patched Rancher versions.
Quoted source text, attributed separately from HOL analysis.