CVE-2021-21362

Name: CVE-2021-21362
Creator: NVD / NIST
Published: 2021-03-08T19:15:13.443+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.32%

Last modified Jun 17, 2026

CVE-2021-21362 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. MinIO is an open-source high performance object storage service and it is API compatible with Amazon S3 cloud storage service. In MinIO before version RELEASE.2021-03-04T00-53-13Z it is possible to bypass a readOnly policy by creating a temporary 'mc share upload' URL. EPSS estimates a 1.32% chance of exploitation in the next 30 days.

Description

MinIO is an open-source high performance object storage service and it is API compatible with Amazon S3 cloud storage service. In MinIO before version RELEASE.2021-03-04T00-53-13Z it is possible to bypass a readOnly policy by creating a temporary 'mc share upload' URL. Everyone is impacted who uses MinIO multi-users. This is fixed in version RELEASE.2021-03-04T00-53-13Z. As a workaround, one can disable uploads with `Content-Type: multipart/form-data` as mentioned in the S3 API RESTObjectPOST docs by using a proxy in front of MinIO.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.32%

67.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Minio	Minio	< 2021-03-04t00-53-13z

References

https://github.com/minio/minio/commit/039f59b552319fcc2f83631bb421a7d4b82bc482Patch, Third Party Advisory
https://github.com/minio/minio/pull/11682Exploit, Third Party Advisory
https://github.com/minio/minio/releases/tag/RELEASE.2021-03-04T00-53-13ZRelease Notes, Third Party Advisory
https://github.com/minio/minio/security/advisories/GHSA-hq5j-6r98-9m8vThird Party Advisory
https://github.com/minio/minio/commit/039f59b552319fcc2f83631bb421a7d4b82bc482Patch, Third Party Advisory
https://github.com/minio/minio/pull/11682Exploit, Third Party Advisory
https://github.com/minio/minio/releases/tag/RELEASE.2021-03-04T00-53-13ZRelease Notes, Third Party Advisory
https://github.com/minio/minio/security/advisories/GHSA-hq5j-6r98-9m8vThird Party Advisory

Timeline

Published: Mar 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21362?

How severe is CVE-2021-21362?

CVE-2021-21362 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.32% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21362?

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-2021-21362?

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

Scan your code now

Source: NVD / NIST