What is CVE-2021-39235?

CVE-2021-39235 is a medium-severity vulnerability in Apache Ozone, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 6.5/10. Published 2021-11-19.

How severe is CVE-2021-39235?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Apache Ozone

CVE-2021-39235

In Apache Ozone before 1.2.0, Ozone Datanode doesn't check the access mode parameter of the block token. Authenticated users with valid READ block token can do any write operation on the same block.

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

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.016 (74.9th percentile), scored 2026-10-22.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000

Affected products

Apache Ozone
Apache Software Foundation Ozone — versions 1.0

Weakness classification (CWE)

CWE-732 — Incorrect Permission Assignment for Critical Resource

References

mail-archives.apache.org/mod_mbox/ozone-dev/202111.mbox/<93f88246-4320-7423-0da… (Mailing List, Vendor Advisory)
www.openwall.com/lists/oss-security/2021/11/19/6 (mailing-list, Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2021-39235?: CVE-2021-39235 is a medium-severity vulnerability in Apache Ozone, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 6.5/10. Published 2021-11-19.
How severe is CVE-2021-39235?: Medium severity. CVSS v3 base score is 6.5 out of 10.