What is CVE-2021-39234?

CVE-2021-39234 is a medium-severity vulnerability in Apache Ozone, classified under Improper Input Validation. CVSS score: 6.8/10. Published 2021-11-19.

How severe is CVE-2021-39234?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Auth bypass in Apache Ozone

CVE-2021-39234

In Apache Ozone versions prior to 1.2.0, Authenticated users knowing the ID of an existing block can craft specific request allowing access those blocks, bypassing other security checks like ACL.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

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

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.014 (72.5th percentile), scored 2026-10-22.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Apache Ozone
Apache Software Foundation Ozone — versions 1.1

Weakness classification (CWE)

References

mail-archives.apache.org/mod_mbox/ozone-dev/202111.mbox/<97d65498-7f8c-366f-1be… (Mailing List, Vendor Advisory)
www.openwall.com/lists/oss-security/2021/11/19/5 (mailing-list, Third Party Advisory)

Frequently asked questions

What is CVE-2021-39234?: CVE-2021-39234 is a medium-severity vulnerability in Apache Ozone, classified under Improper Input Validation. CVSS score: 6.8/10. Published 2021-11-19.
How severe is CVE-2021-39234?: Medium severity. CVSS v3 base score is 6.8 out of 10.