CVE-2021-25320

Rancher: Cloud credentials can be used through proxy API by users without access

CVSS 3.1 9.9 CRITICALEUVD CVSS 3.1 9.9 CVSS 3.1 · [email protected] · Secondary 9.9 CRITICALCVSS 3.1 · [email protected] · Primary 9.9 CRITICALCVSS 2.0 · [email protected] · Primary 4.0 MEDIUMCVSS_V3 Publisher rating CRITICALFixed by github.com/rancher/rancher 2.4.16 Fixed by github.com/rancher/rancher 2.5.9osv · severity unknownKEV status unknown

Original advisory

cve-program · CVE-2021-25320

Published

A Improper Access Control vulnerability in Rancher, allows users in the cluster to make request to cloud providers by creating requests with the cloud-credential ID. Rancher in this case would attach the requested credentials without further checks This issue affects: Rancher versions prior to 2.5.9; Rancher versions prior to 2.4.16.

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euvd · EUVD-2021-12217

Published

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nvd · CVE-2021-25320

Published

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osv · GHSA-gqf8-rvrh-g7w6

Published

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.

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osv · GO-2026-4589

Published

Rancher cloud credentials can be used through proxy API by users without access in github.com/rancher/rancher. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/rancher/rancher before v2.4.16, from v2.5.0 before v2.5.9.

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Affected versions, risk and source history

cve-program · CVE-2021-25320

Published

Rancher

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Rancher",
                    "vendor": "Rancher",
                    "versions": [
                        {
                            "lessThan": "2.5.9",
                            "status": "affected",
                            "version": "Rancher",
                            "versionType": "custom"
                        }
                    ]
                }

Rancher

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "product": "Rancher",
                    "vendor": "Rancher",
                    "versions": [
                        {
                            "lessThan": "2.4.16",
                            "status": "affected",
                            "version": "Rancher",
                            "versionType": "custom"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON

euvd · EUVD-2021-12217

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Jul 15, 2021, 8:55:17 AM

dateUpdated: Sep 16, 2024, 8:21:51 PM

No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.

Original source record · Cite this exact observation · Complete original publisher JSON

nvd · CVE-2021-25320

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Modified

Weakness classifications: CWE-284 · NVD-CWE-Other

Original publisher date fields

published: 2021-07-15T09:15:08.143

lastModified: 2026-06-17T03:41:49.400

1 source CPE criteria · context only

cpe:2.3:a:rancher:rancher:*:*:*:*:*:*:*:*

The original JSON retains the logical configuration operators, exclusions and version bounds.

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GHSA-gqf8-rvrh-g7w6

Published

github.com/rancher/rancher

SEMVER · introduced 2.2.0 → fixed 2.4.16

github.com/rancher/rancher

SEMVER · introduced 2.5.0 → fixed 2.5.9

Original source record · Cite this exact observation · Complete original publisher JSON

osv · GO-2026-4589

Published

github.com/rancher/rancher

SEMVER · introduced 2.2.0+incompatible

Original source record · Cite this exact observation · Complete original publisher JSON