CVE-2021-43858

Name: CVE-2021-43858
Creator: NVD / NIST
Published: 2021-12-27T22:15:07.703+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 35.46%

Last modified Jun 17, 2026

CVE-2021-43858 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 35.46% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

35.46%

98.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Minio	Minio	< 2021-12-27t07-23-18z

References

https://github.com/minio/minio/commit/5a96cbbeaabd0a82b0fe881378e7c21c85091abfPatch, Third Party Advisory
https://github.com/minio/minio/pull/13976Patch, Third Party Advisory
https://github.com/minio/minio/pull/7949Patch, Third Party Advisory
https://github.com/minio/minio/releases/tag/RELEASE.2021-12-27T07-23-18ZRelease Notes, Third Party Advisory
https://github.com/minio/minio/security/advisories/GHSA-j6jc-jqqc-p6cxPatch, Third Party Advisory
https://github.com/minio/minio/commit/5a96cbbeaabd0a82b0fe881378e7c21c85091abfPatch, Third Party Advisory
https://github.com/minio/minio/pull/13976Patch, Third Party Advisory
https://github.com/minio/minio/pull/7949Patch, Third Party Advisory
https://github.com/minio/minio/releases/tag/RELEASE.2021-12-27T07-23-18ZRelease Notes, Third Party Advisory
https://github.com/minio/minio/security/advisories/GHSA-j6jc-jqqc-p6cxPatch, Third Party Advisory

Timeline

Published: Dec 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43858?

How severe is CVE-2021-43858?

CVE-2021-43858 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 35.46% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43858?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-43858?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST