CVE-2021-39231Network attack vector

Unauthenticated data access via unguarded internal RPC

Published Nov 19, 2021 · Updated Aug 4, 2024

Missing authorization in Apache Ozone 1.0 allows remote attackers to read raw cluster data and alter Ratis replication configuration. Internal server-to-server RPC endpoints accept connections without authenticating or authorizing the caller before serving Datanode and Ozone Manager data or applying replication changes. Network reachability to those internal RPC services is sufficient; the documented impact is data disclosure and replication-configuration modification, not service interruption.

CVSS severity9.1
Critical
EPSS probability2.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Apache Ozone 1.0 allows remote attackers to read raw cluster data and alter Ratis replication configuration. Internal server-to-server RPC endpoints accept connections without authenticating or authorizing the caller before serving Datanode and Ozone Manager data or applying replication changes. Network reachability to those internal RPC services is sufficient; the documented impact is data disclosure and replication-configuration modification, not service interruption.

The record

CVE
CVE-2021-39231
Published
Nov 19, 2021
Updated
Aug 4, 2024
Vendor
The Apache Software Foundation
Product
Apache Ozone
Classifications
CWE-862, T1210
Attack vector
network
Privileges
unauthenticated

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=1.0 <=1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Ozoneversion=1.0 <=1.0

Published CVSS scores

6.4NIST National Vulnerability DatabaseAV:N/AC:L/Au:N/C:P/I:P/A:N
9.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1210Exploitation of Remote Services

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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