CVE-2025-53047: Oracle Database Server Info Disclosure Bug

CVE-2025-53047 Overview

CVE-2025-53047 is an information disclosure vulnerability in the Portable Clusterware component of Oracle Database Server. The flaw allows an unauthenticated attacker with network access via Bonjour to compromise Portable Clusterware. Successful exploitation results in unauthorized read access to a subset of Portable Clusterware accessible data. The vulnerability is classified under CWE-200: Exposure of Sensitive Information to an Unauthorized Actor. Because the vulnerability involves a scope change, attacks may significantly impact additional products beyond Portable Clusterware itself. Oracle addressed the issue in the Oracle Critical Patch Update - October 2025.

Critical Impact
Unauthenticated network attackers can read sensitive data from Oracle Portable Clusterware via the Bonjour service, with potential impact extending beyond the vulnerable component due to scope change.

Affected Products

Oracle Database Server Portable Clusterware versions 19.3 through 19.28
Oracle Database Server Portable Clusterware versions 21.3 through 21.19
Oracle Database Server Portable Clusterware versions 23.4 through 23.9

Discovery Timeline

2025-10-21 - CVE-2025-53047 published to NVD as part of the Oracle Critical Patch Update - October 2025
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-53047

Vulnerability Analysis

CVE-2025-53047 resides in Oracle Portable Clusterware, a component that enables clustering capabilities for Oracle Database Server deployments. The vulnerable code path is reachable through the Bonjour zero-configuration networking protocol, which provides service discovery on local networks. An unauthenticated attacker with network access to the Bonjour service can query the component and retrieve data that should not be exposed. The attack complexity is low and no user interaction or privileges are required. The scope change indicator signals that impact may extend to resources managed under a different security authority than the vulnerable component itself.

Root Cause

The root cause is improper access control on data exposed through the Bonjour interface of Portable Clusterware. The service responds to network queries without enforcing authentication, allowing disclosure of a subset of clusterware data. This aligns with [CWE-200], which covers exposure of sensitive information to actors not explicitly authorized to receive it.

Attack Vector

Exploitation requires network reachability to the Bonjour service used by Portable Clusterware. The attacker sends crafted service discovery or query traffic and receives clusterware information in the response. No authentication is required. Because Bonjour typically operates over multicast DNS (mDNS) on UDP port 5353, exposure is most acute on flat networks where clusterware nodes share broadcast domains with untrusted hosts. Public technical details and proof-of-concept code have not been released.

Detection Methods for CVE-2025-53047

Indicators of Compromise

Unexpected mDNS or Bonjour queries (UDP port 5353) directed at Oracle Database cluster nodes from hosts outside the clusterware trust boundary.
Anomalous service discovery responses containing Portable Clusterware metadata leaving the cluster network segment.
Repeated Bonjour service enumeration requests from a single source targeting multiple cluster nodes.

Detection Strategies

Monitor network flow data for inbound UDP 5353 traffic to Oracle Database Server hosts from sources that should not participate in clusterware service discovery.
Inspect packet captures for mDNS queries referencing Oracle clusterware service types and correlate with authorized administrative activity.
Baseline expected Bonjour peers per cluster node and alert on new or external responders.

Monitoring Recommendations

Enable network segmentation logging between database cluster subnets and general-purpose networks to identify policy violations.
Forward Oracle Grid Infrastructure and clusterware logs to a centralized analytics platform for correlation with network telemetry.
Track the versions of Oracle Database Server deployed across the estate to identify unpatched Portable Clusterware installations.

How to Mitigate CVE-2025-53047

Immediate Actions Required

Apply the fixes from the Oracle Critical Patch Update - October 2025 to all affected Oracle Database Server installations.
Inventory Oracle Database Server deployments running versions 19.3-19.28, 21.3-21.19, and 23.4-23.9 to prioritize patching.
Restrict network access to UDP port 5353 on database cluster nodes so that only authorized clusterware peers can communicate.

Patch Information

Oracle released remediation as part of the Oracle Critical Patch Update - October 2025. Administrators should download and apply the applicable Release Update or bundle patch for their Database Server version by consulting the Oracle Critical Patch Update Advisory and the vendor documentation for each affected release train (19c, 21c, 23ai).

Workarounds

Place clusterware nodes on a dedicated, isolated network segment with strict ingress controls blocking Bonjour traffic from untrusted sources.
Configure host-based firewalls on database servers to permit mDNS traffic only from known cluster peer addresses.
Disable Bonjour or mDNS responder services on hosts where clusterware service discovery is not required.

bash

# Example: restrict inbound mDNS (UDP 5353) to trusted cluster peers using iptables
iptables -A INPUT -p udp --dport 5353 -s 10.0.10.11 -j ACCEPT
iptables -A INPUT -p udp --dport 5353 -s 10.0.10.12 -j ACCEPT
iptables -A INPUT -p udp --dport 5353 -j DROP