CVE-2021-21362

mediumpriority · track · 26OT risk · elevatedEPSS 0.013 · 71 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.32% (71st) EPSS

CVSS 4 · medium

Is it mine?

6 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

7.7

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4–7.7

v2.04mediumAV:N/AC:L/Au:S/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8 · impact 2.9

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 3.6

v3.17.7highAV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:Nsecondary · FSTEC (BDU) RU

v3.17.7highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:Nsecondary · ENISA EU

v3.17.7highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:Nsecondary · security-advisories@github.comexploitability 3.1 · impact 4

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-863USprimaryCWE-285USCWE-285US

affected products (6)

Products and version ranges known to be affected.

minio minio≤ < RELEASE.2021-03-04T00-53-13Zenisa_euvdEU
IBM Corp. IBM Spectrum Protect Plus10.1.5 → 10.1.8fstec_bduRU
IBM Corp. IBM Spectrum Protect Plus10.1.7 → 10.1.8fstec_bduRU
MinIO Inc MinIO≤ 2021-03-04t00-53-13zfstec_bduRU
minio minio< 2021-03-04t00-53-13znvdUScpe:2.3:a:minio:minio:*:*:*:*:*:*:*:*
Bitnami minio< 2021.03.04osvUSpkg:bitnami/minio

advisories (1)

Vendor and ecosystem advisories describing this.

BIT-minio-2021-21362Bypassing readOnly policy by creating a temporary 'mc share upload' URL2024-03-06vendor · osvUS
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.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu osv nvd NVD CVE.org MITRE

published 2021-03-08modified 2026-06-17

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+5004 more

references (14)

External citations — patches, advisories, analysis.

scry

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