CVE-2021-41571

Name: CVE-2021-41571
Creator: NVD / NIST
Published: 2022-02-01T13:15:09.663+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.77%

Last modified Jun 17, 2026

CVE-2021-41571 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 1.77% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.77%

75.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Apache	Pulsar	>= 2.6.0, < 2.6.4
Apache	Pulsar	>= 2.7.0, < 2.7.3
Apache	Pulsar	2.8.0

References

https://github.com/apache/pulsar/issues/11814Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.apache.org/thread/8n3k7pvyh4cf9q2jfzb6pb32ync6xlvrMailing List, Vendor Advisory
https://pulsar.apache.org/admin-rest-api/#operation/getLastMessageIdPatch, Vendor Advisory
https://github.com/apache/pulsar/issues/11814Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.apache.org/thread/8n3k7pvyh4cf9q2jfzb6pb32ync6xlvrMailing List, Vendor Advisory
https://pulsar.apache.org/admin-rest-api/#operation/getLastMessageIdPatch, Vendor Advisory

Timeline

Published: Feb 1, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41571?

How severe is CVE-2021-41571?

CVE-2021-41571 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.77% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41571?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-41571?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST