CVE-2025-53047 is a vulnerability identified in the Portable Clusterware component of Oracle Database Server, affecting versions 19.3 through 19.28, 21.3 through 21.19, and 23.4 through 23.9. The flaw allows an unauthenticated attacker with network access via the Bonjour protocol to exploit the vulnerability remotely without any user interaction or privileges. The attack vector is network-based (AV:N), with low attack complexity (AC:L), no privileges required (PR:N), and no user interaction needed (UI:N). The vulnerability results in unauthorized read access to a subset of data accessible through Portable Clusterware, impacting confidentiality but not integrity or availability. The scope is changed (S:C), meaning that although the vulnerability resides in Portable Clusterware, exploitation could affect other Oracle products integrated with or dependent on this component. The vulnerability is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor). While no public exploits have been reported, the ease of exploitation and network accessibility make it a significant concern. The lack of available patches at the time of publication necessitates immediate attention to mitigation strategies. The Bonjour protocol, commonly used for zero-configuration networking, can expose the affected component to attackers on the same network or via routed Bonjour traffic, increasing the attack surface.

For European organizations, the impact of CVE-2025-53047 primarily concerns unauthorized disclosure of sensitive data within Oracle Database Server environments that utilize Portable Clusterware. Sectors such as finance, telecommunications, government, and critical infrastructure, which often rely on Oracle databases for mission-critical operations, could face data confidentiality breaches. The vulnerability’s network accessibility and lack of authentication requirements increase the risk of exploitation from both internal and external threat actors. The scope change implies that other Oracle products integrated with Portable Clusterware might also be indirectly affected, potentially broadening the impact. Data exposure could lead to regulatory compliance issues under GDPR, reputational damage, and potential financial losses. The absence of known exploits in the wild provides a window for proactive defense, but the medium severity score indicates that organizations should not underestimate the risk, especially given Oracle’s widespread deployment across Europe.

European organizations should immediately inventory their Oracle Database Server deployments to identify affected versions (19.3-19.28, 21.3-21.19, 23.4-23.9) running Portable Clusterware. Network segmentation should be enforced to restrict Bonjour protocol traffic, limiting exposure to trusted internal networks only. Disable or block Bonjour services on database servers if not required, or restrict multicast DNS traffic at network boundaries. Monitor network traffic for unusual Bonjour activity and implement intrusion detection/prevention systems with signatures targeting this vulnerability once available. Apply Oracle’s security advisories promptly when patches are released. Until patches are available, consider deploying virtual patching via Web Application Firewalls or database activity monitoring tools to detect and block suspicious queries or access patterns related to Portable Clusterware. Conduct regular audits of database access logs to detect unauthorized read attempts. Educate system administrators about the vulnerability and the importance of minimizing unnecessary network services on critical database servers.