CVE-2021-43858

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 35.5%, top 2% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 35%CVSS: 8.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

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.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
35%
EPSS %ILE
98%
KEV
Not listed

Published

December 27, 2021

Last Modified

November 21, 2024

Advisory Details (5)

Auto-updated Aug 30, 2026
Patch available. Sources: github, github_commit, github_pr, github_release.
github Patch Available

User privilege escalation in AddUser() admin API · Advisory · minio/minio · GitHub

https://github.com/minio/minio/security/advisories/GHSA-j6jc-jqqc-p6cx
github_release Patch Available

Security Bugfix Release

Patch available: minio/minio RELEASE.2021-12-27T07-23-18Z

https://github.com/minio/minio/releases/tag/RELEASE.2021-12-27T07-23-18Z
github_pr

Update on-disk storage format for users system

Fix merged in minio/minio PR #7949 on 2019-07-25 — awaiting tagged release

https://github.com/minio/minio/pull/7949
github_pr

fix: user privilege escalation bug

Fix merged in minio/minio PR #13976 on 2021-12-23 — awaiting tagged release

https://github.com/minio/minio/pull/13976
github_commit

commit 5a96cbbeaabd (minio/minio)

Fix landed in minio/minio commit 5a96cbbeaabd — awaiting tagged release

https://github.com/minio/minio/commit/5a96cbbeaabd0a82b0fe881378e7c21c85091abf

Vendor Advisories for CVE-2021-43858(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhacm2/search-collector-rhel8:v2.5.0-202022-06-09redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 26× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 122 total refreshes for this CVE.

  1. 2026-09-06 13:45 UTCEPSS rescore
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Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Frequently asked(5)

What is CVE-2021-43858?
CVE-2021-43858 is a high vulnerability published on December 27, 2021. 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…
When was CVE-2021-43858 disclosed?
CVE-2021-43858 was first published in the National Vulnerability Database on December 27, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-43858 actively exploited?
CVE-2021-43858 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35% probability of exploitation in the next 30 days, which ranks it in the top 1.7% of all scored CVEs.
What is the CVSS score of CVE-2021-43858?
CVE-2021-43858 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2021-43858?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-43858, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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