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Vulnerability record · CVE-2021-41571 · published 1 February 2022

CVE-2021-41571: Apache pulsar incorrect authorization vulnerability

Apache · Pulsar

In Apache Pulsar it is possible to access data from BookKeeper that does not belong to the topics accessible by the authenticated user. The Admin API get-message-by-id requires the user to input a topic and a ledger id. The ledger id is a pointer to the data, and it is supposed to be a valid it for the topic. Authorisation controls are performed against the topic name and there is not proper validation the that ledger id is valid in the context of such ledger. So it may happen that the user is able to read from a ledger that contains data owned by another tenant. This issue affects Apache Pulsar Apache Pulsar version 2.8.0 and prior versions; Apache Pulsar version 2.7.3 and prior versions; Apache Pulsar version 2.6.4 and prior versions.

6.5 CVSS 3.1 Medium EPSS 1.7% · top 23.4% CWE-863 · Incorrect authorization
6.5CVSS 3.1 base score, v2 4.0
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

In Apache Pulsar it is possible to access data from BookKeeper that does not belong to the topics accessible by the authenticated user. The Admin API get-message-by-id requires the user to input a topic and a ledger id. The ledger id is a pointer to the data, and it is supposed to be a valid it for the topic. Authorisation controls are performed against the topic name and there is not proper validation the that ledger id is valid in the context of such ledger. So it may happen that the user is able to read from a ledger that contains data owned by another tenant. This issue affects Apache Pulsar Apache Pulsar version 2.8.0 and prior versions; Apache Pulsar version 2.7.3 and prior versions; Apache Pulsar version 2.6.4 and prior versions.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/apache/pulsar/issues/11814 ExploitIssue TrackingPatchThird Party Advisory
https://lists.apache.org/thread/8n3k7pvyh4cf9q2jfzb6pb32ync6xlvr Mailing ListVendor Advisory
https://pulsar.apache.org/admin-rest-api/#operation/getLastMessageId PatchVendor Advisory
https://github.com/apache/pulsar/issues/11814 ExploitIssue TrackingPatchThird Party Advisory
https://lists.apache.org/thread/8n3k7pvyh4cf9q2jfzb6pb32ync6xlvr Mailing ListVendor Advisory
https://pulsar.apache.org/admin-rest-api/#operation/getLastMessageId PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-41571), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.