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CVE-2021-39235

22
FAUCET Score

CVE-2021-39235 describes a vulnerability in Apache Ozone versions prior to 1.2.0, where an authenticated user with a valid READ block token could perform unauthorized write operations on the same block due to insufficient access mode validation. This medium-severity vulnerability (CVSS 6.5) has a low attack complexity and requires prior authentication, leading to a high impact on integrity but no impact on confidentiality or availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.2.0CPE matchmatch criteria
cpe:2.3:a:apache:ozone:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.50%
Probability of exploitation in next 30 days
EPSS Percentile
71.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0150 is in the 85th percentile among its peer group of 21,974 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

mavenpatch availablevia ghsa
Product: org.apache.ozone:ozone-mainFixed in: 1.2.0

Vendor Advisories (1)

mavenGHSA-c6j7-4fr9-c76pmedium

Incorrect permissions in Apache Ozone

Nov 23, 2021

References

mail-archives.apache.org / mod_mbox/ozone-dev/202111.mbox/%3C93f88246-4320-7423-0dac-ec7a07f47455%40apache.org%3E
Mailing ListVendor Advisory
openwall.com / lists/oss-security/2021/11/19/6
Mailing ListThird Party Advisory