CVE-2021-21287: MinIO is a High Performance Object Storage released under Apache License v2.0. In MinIO before version RELEASE.2021-01-30T00-20-58Z there is a server-...

Description

MinIO is a High Performance Object Storage released under Apache License v2.0. In MinIO before version RELEASE.2021-01-30T00-20-58Z there is a server-side request forgery vulnerability. The target application may have functionality for importing data from a URL, publishing data to a URL, or otherwise reading data from a URL that can be tampered with. The attacker modifies the calls to this functionality by supplying a completely different URL or by manipulating how URLs are built (path traversal etc.). In a Server-Side Request Forgery (SSRF) attack, the attacker can abuse functionality on the server to read or update internal resources. The attacker can supply or modify a URL which the code running on the server will read or submit data, and by carefully selecting the URLs, the attacker may be able to read server configuration such as AWS metadata, connect to internal services like HTTP enabled databases, or perform post requests towards internal services which are not intended to be exposed. This is fixed in version RELEASE.2021-01-30T00-20-58Z, all users are advised to upgrade. As a workaround you can disable the browser front-end with "MINIO_BROWSER=off" environment variable.

Metrics

CVSS 3.1

7.7/10

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

EPSS Probability

24.78%

97.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-918

Affected Software

Vendor	Product	Versions
Minio	Minio	< 2021-01-30t00-20-58z

References

https://github.com/minio/minio/commit/eb6871ecd960d570f70698877209e6db181bf276Patch, Third Party Advisory
https://github.com/minio/minio/pull/11337Patch, Third Party Advisory
https://github.com/minio/minio/releases/tag/RELEASE.2021-01-30T00-20-58ZRelease Notes, Third Party Advisory
https://github.com/minio/minio/security/advisories/GHSA-m4qq-5f7c-693qThird Party Advisory
https://github.com/minio/minio/commit/eb6871ecd960d570f70698877209e6db181bf276Patch, Third Party Advisory
https://github.com/minio/minio/pull/11337Patch, Third Party Advisory
https://github.com/minio/minio/releases/tag/RELEASE.2021-01-30T00-20-58ZRelease Notes, Third Party Advisory
https://github.com/minio/minio/security/advisories/GHSA-m4qq-5f7c-693qThird Party Advisory

Timeline

Published: Feb 1, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-21287?

MinIO is a High Performance Object Storage released under Apache License v2.0. In MinIO before version RELEASE.2021-01-30T00-20-58Z there is a server-side request forgery vulnerability. The target application may have functionality for importing data from a URL, publishing data to a URL, or otherwise reading data from a URL that can be tampered with. The attacker modifies the calls to this functionality by supplying a completely different URL or by manipulating how URLs are built (path traversal etc.). In a Server-Side Request Forgery (SSRF) attack, the attacker can abuse functionality on the server to read or update internal resources. The attacker can supply or modify a URL which the code running on the server will read or submit data, and by carefully selecting the URLs, the attacker may be able to read server configuration such as AWS metadata, connect to internal services like HTTP enabled databases, or perform post requests towards internal services which are not intended to be exposed. This is fixed in version RELEASE.2021-01-30T00-20-58Z, all users are advised to upgrade. As a workaround you can disable the browser front-end with "MINIO_BROWSER=off" environment variable.

How severe is CVE-2021-21287?

CVE-2021-21287 has a CVSS score of 7.7/10 (HIGH severity). The EPSS model estimates a 24.78% probability of exploitation in the next 30 days.

How do I fix CVE-2021-21287?

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.