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Tool Directory

CVE-2021-43858

HighPublished

User privilege escalation in MinIO

Published: Dec 27, 2021
Updated: Aug 4, 2024
Assigning CNA: GitHub_M
Evidence observed: Aug 8, 2026

Primary CVSS

8.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

35.5%

Moderate · next 30 days

Percentile: 98.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

MinIO is a Kubernetes native application for cloud storage. Prior to version `RELEASE.2021-12-27T07-23-18Z`, a malicious client can hand-craft an HTTP API call that allows for updating policy for a user and gaining higher privileges. The patch in version `RELEASE.2021-12-27T07-23-18Z` changes the accepted request body type and removes the ability to apply policy changes through this API. There is a workaround for this vulnerability: Changing passwords can be disabled by adding an explicit `Deny` rule to disable the API for users.

Sources

cve-2021-43858Exploit
Exploit for MinIO privilege escalation vulnerability CVE-2021-43858, allowing unauthorized access to cloud storage. Written in Go, run with 'go run exp.go'.
CVE-2021-43858-MinIOExploit
Go-based exploit for CVE-2021-43858 targeting MinIO privilege escalation vulnerability. Executes against a specified IP and port to demonstrate the security flaw.

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