CVE-2021-25320Network attack vector

Cloud API access via unchecked credential identifiers

Published Jul 15, 2021 · Updated Sep 16, 2024

Improper access control in Rancher 2.2.0 through 2.4.15 and 2.5.0 through 2.5.8 allows remote authenticated users to access cloud APIs. The cloud-provider proxy accepts a caller-supplied cloud-credential ID and attaches the corresponding credential without checking the caller's access. A valid Rancher account and knowledge of an existing provider-specific credential ID are required; requests then execute with that credential's permissions.

CVSS severity9.9
Critical
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Rancher 2.2.0 through 2.4.15 and 2.5.0 through 2.5.8 allows remote authenticated users to access cloud APIs. The cloud-provider proxy accepts a caller-supplied cloud-credential ID and attaches the corresponding credential without checking the caller's access. A valid Rancher account and knowledge of an existing provider-specific credential ID are required; requests then execute with that credential's permissions.

The record

CVE
CVE-2021-25320
Published
Jul 15, 2021
Updated
Sep 16, 2024
Vendor
Rancher
Product
Rancher
Classifications
CWE-284, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Rancher <2.4.16
  2. Affected versionversion=Rancher <2.5.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Rancher · Rancherversion=Rancher <2.4.16; version=Rancher <2.5.9

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
9.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
9.9SUSECVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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