CVE-2026-47040

Analyzed Analyzed - Analysis Complete

Unauthenticated Network Access in Oracle Database Server

Publication date: 2026-07-21

Last updated on: 2026-08-06

Assigner: Oracle

Description

Vulnerability in the Oracle Net Services component of Oracle Database Server. Supported versions that are affected are 19.3-19.31, 21.3-21.22 and 23.4.0-23.26.2. Easily exploitable vulnerability allows unauthenticated attacker with network access via Oracle Net to compromise Oracle Net Services. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Net Services accessible data and unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Net Services. CVSS 3.1 Base Score 9.1 (Confidentiality and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H).

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-07-21

Last Modified

2026-08-06

Generated

2026-08-11

AI Q&A

2026-07-22

EPSS Evaluated

2026-08-10

NVD

CVE-2026-47040

EUVD

EUVD-2026-46527

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	database_server	From 19.3 (inc) to 19.31 (inc)
oracle	database_server	From 21.3 (inc) to 21.22 (inc)
oracle	database_server	From 23.4 (inc) to 23.26.2 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-306	The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

Attack-Flow Graph

Executive Summary

This is a vulnerability in Oracle Net Services, part of Oracle Database Server. It allows an unauthenticated attacker with network access to exploit the system. Successful exploitation can lead to unauthorized access to critical data or a complete denial of service (DoS) for Oracle Net Services.

Detection Guidance

Detection requires checking Oracle Database Server versions. Affected versions are 19.3-19.31, 21.3-21.22, and 23.4.0-23.26.2. Use SQL queries like SELECT * FROM v$version to identify installed versions.

Impact Analysis

If exploited, this vulnerability could allow attackers to access sensitive data stored in the database or cause the database service to crash repeatedly. This could disrupt operations and expose confidential information.

Compliance Impact

This vulnerability could lead to unauthorized data access, which may violate GDPR (data protection) and HIPAA (health data privacy) requirements. Non-compliance risks fines and legal consequences.

Mitigation Strategies

Apply the latest Oracle Critical Patch Update (CPU) for your version. Disable Oracle Net Services if not required. Restrict network access via firewalls to trusted sources only.

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