CVE-2021-39234Network attack vector

Authenticated raw block disclosure via ACL bypass

Published Nov 19, 2021 · Updated Aug 4, 2024

Incorrect authorization in Apache Ozone 1.1 allows remote authenticated users to read raw blocks by submitting known block IDs. The Datanode block-read path serves a crafted request for an existing block without enforcing the object's ACL; Apache has not disclosed the affected function or request field. An account and a valid existing block ID are required, and successful access discloses that block's raw data without a reported availability impact.

CVSS severity6.8
Medium
EPSS probability1.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Apache Ozone 1.1 allows remote authenticated users to read raw blocks by submitting known block IDs. The Datanode block-read path serves a crafted request for an existing block without enforcing the object's ACL; Apache has not disclosed the affected function or request field. An account and a valid existing block ID are required, and successful access discloses that block's raw data without a reported availability impact.

The record

CVE
CVE-2021-39234
Published
Nov 19, 2021
Updated
Aug 4, 2024
Vendor
The Apache Software Foundation
Product
Apache Ozone
Classifications
CWE-20, CWE-863, T1530
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.1 <=1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Ozoneversion=1.1 <=1.1

Published CVSS scores

6.8NIST NVDCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
4.9NIST NVDAV:N/AC:M/Au:S/C:P/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-863Incorrect Authorization
T1530Data from Cloud Storage

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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