CVE-2021-41571Network attack vector

Cross-tenant message disclosure via unchecked ledger ID

Published Feb 1, 2022 · Updated Aug 4, 2024

Incorrect authorization in Apache Pulsar 2.8.0 and earlier allows remote authenticated users to read another tenant's messages. PersistentTopicsBase.internalGetMessageById authorizes the supplied topic name but fails to verify that the supplied ledger ID belongs to that topic. An authenticated user with access to one topic can therefore retrieve message data stored in another tenant's ledger.

CVSS severity6.5
Medium
EPSS probability1.73%
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 Pulsar 2.8.0 and earlier allows remote authenticated users to read another tenant's messages. PersistentTopicsBase.internalGetMessageById authorizes the supplied topic name but fails to verify that the supplied ledger ID belongs to that topic. An authenticated user with access to one topic can therefore retrieve message data stored in another tenant's ledger.

The record

CVE
CVE-2021-41571
Published
Feb 1, 2022
Updated
Aug 4, 2024
Vendor
The Apache Software Foundation
Product
Apache Pulsar
Classifications
CWE-863, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 1, 2022CVE 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=Apache Pulsar <=2.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Pulsarversion=Apache Pulsar <=2.8.0

Published CVSS scores

4.0NIST NVDAV:N/AC:L/Au:S/C:P/I:N/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1213Data from Information Repositories

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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