CVE-2025-30677: 
Java vulnerability analysis and mitigation

Apache Pulsar contains multiple connectors for integrating with Apache Kafka. The vulnerability (CVE-2025-30677) affects the Pulsar IO Apache Kafka Source Connector, Sink Connector, and Kafka Connect Adaptor Sink Connector, which log sensitive configuration properties in plain text in application logs. The issue affects Apache Pulsar IO's Apache Kafka connectors in all versions before 3.0.11, 3.3.6, and 4.0.4, and was discovered by Kyler Katz (Apache Security).

The vulnerability stems from the improper handling of sensitive configuration properties in application logs, where these properties are logged in plain text format. The issue has been assigned CWE-532 (Insertion of Sensitive Information into Log File). The vulnerability has received a CVSS 4.0 Base Score of 6.3 (MEDIUM) with the vector string CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N (NVD Database).

This vulnerability can lead to unintended exposure of credentials in log files, potentially allowing attackers with access to these logs to obtain Apache Kafka credentials. The vulnerability's impact is limited by the fact that an attacker would need access to the application logs to exploit this issue (OSS Security).

The exploitability of this vulnerability requires an attacker to have access to the application logs. Once access is obtained, the attacker could potentially retrieve Apache Kafka credentials that were logged in plain text format (NVD Database).

Users are advised to upgrade to the patched versions: 3.0.x version users should upgrade to at least 3.0.11, 3.3.x version users should upgrade to at least 3.3.6, and 4.0.x version users should upgrade to at least 4.0.4. Users operating versions prior to those listed should upgrade to the aforementioned patched versions or newer versions (Apache Security).