CVE-2023-31007: Apache Pulsar: Broker does not always disconnect client when authentication data expires

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-07-12 · updated 2026-06-17
Weakness: CWE-287

Description

Improper Authentication vulnerability in Apache Software Foundation Apache Pulsar Broker allows a client to stay connected to a broker after authentication data expires if the client connected through the Pulsar Proxy when the broker is configured with authenticateOriginalAuthData=false or if a client connects directly to a broker with a specially crafted connect command when the broker is configured with authenticateOriginalAuthData=false. This issue affects Apache Pulsar: through 2.9.4, from 2.10.0 through 2.10.3, 2.11.0. 2.9 Pulsar Broker users should upgrade to at least 2.9.5. 2.10 Pulsar Broker users should upgrade to at least 2.10.4. 2.11 Pulsar Broker users should upgrade to at least 2.11.1. 3.0 Pulsar Broker users are unaffected. Any users running the Pulsar Broker for 2.8.* and earlier should upgrade to one of the above patched versions.

Affected products

Apache Software Foundation Apache Pulsar: before 2.9.5; from 2.10.0 through 2.10.3; 2.11.0, 2.11.0-candidate_1, 2.11.0-candidate_5 — fixed in 2.9.5

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Pulsar 2.9.5. Check the vendor advisory for mitigations.

References

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