CVE-2021-21390
MEDIUMDescription
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.2021-03-17T02-33-02Z, there is a vulnerability which enables MITM modification of request bodies that are meant to have integrity guaranteed by chunk signatures. In a PUT request using aws-chunked encoding, MinIO ordinarily verifies signatures at the end of a chunk. This check can be skipped if the client sends a false chunk size that is much greater than the actual data sent: the server accepts and completes the request without ever reaching the end of the chunk + thereby without ever checking the chunk signature. This is fixed in version RELEASE.2021-03-17T02-33-02Z. As a workaround one can avoid using "aws-chunked" encoding-based chunk signature upload requests instead use TLS. MinIO SDKs automatically disable chunked encoding signature when the server endpoint is configured with TLS.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Exploit Intelligence
Moderate risk: more likely to be exploited than 55% of all known CVEs.
References
Related Vulnerabilities
Other CWE-924 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2024-3596 | Critical | 9.0 | 15% | - | Fix |
| CVE-2018-14526 | Medium | 6.5 | 1.5% | - | Fix |
| CVE-2022-3166 | High | 7.5 | 0.7% | - | - |
| CVE-2021-34793 | High | 8.6 | 0.6% | - | Fix |
| CVE-2021-3716 | Low | 3.1 | 0.6% | - | Fix |
| CVE-2024-43450 | High | 7.5 | 0.6% | - | Fix |
Common questions
How do I fix CVE-2021-21390?
Upgrade minio to 2021-03-17t02-33-02z or later.
Is CVE-2021-21390 being actively exploited?
Not that we know of. CVE-2021-21390 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.85% is the estimated probability that it will be exploited in the next 30 days. That is higher than 55% of all scored CVEs.
How severe is CVE-2021-21390?
CVE-2021-21390 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2021-21390 affect?
Published advisories record a fix for minio (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2021-21390
Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.