What is CVE-2021-39236?

CVE-2021-39236 is a high-severity vulnerability in Apache Ozone, classified under Missing Authorization. CVSS score: 8.8/10. Published 2021-11-19.

How severe is CVE-2021-39236?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2021-39236 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Apache Ozone

CVE-2021-39236

In Apache Ozone before 1.2.0, Authenticated users with valid Ozone S3 credentials can create specific OM requests, impersonating any other user.

Vulnerability class: Broken Access Control

Published 2021-11-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.026 (85.4th percentile), scored 2026-10-22.

Low probability of exploitation in the next 30 days, but still tracked. 85th percentile — 85.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.026 · newest: 0.026 · change: +0.001

Affected products

Apache Ozone
Apache Software Foundation Ozone — versions 1.0

Weakness classification (CWE)

CWE-862 — Missing Authorization

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

mail-archives.apache.org/mod_mbox/ozone-dev/202111.mbox/<0fd74baa-88a0-39a2-8f3… (Mailing List, Mitigation, Vendor Advisory)
www.openwall.com/lists/oss-security/2021/11/19/7 (mailing-list, Mailing List, Third Party Advisory)
issues.apache.org/jira/browse/HDDS-4763 (issue-tracking, Exploit)

Frequently asked questions

What is CVE-2021-39236?: CVE-2021-39236 is a high-severity vulnerability in Apache Ozone, classified under Missing Authorization. CVSS score: 8.8/10. Published 2021-11-19.
How severe is CVE-2021-39236?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2021-39236 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.