CVE-2026-47040 in Database Server
Summary
by MITRE • 07/22/2026
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).
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Analysis
by VulDB Data Team • 07/22/2026
This vulnerability resides within Oracle Net Services, a critical component of the Oracle Database Server that handles network communications between database clients and servers. The affected versions span multiple release cycles including 19.3 through 19.31, 21.3 through 21.22, and 23.4.0 through 23.26.2, indicating a widespread impact across Oracle's database portfolio. The vulnerability's classification as easily exploitable means that attackers require minimal prerequisites to launch successful attacks, with only network access via Oracle Net being necessary for exploitation. This represents a significant security risk given Oracle's widespread deployment in enterprise environments where database systems handle sensitive organizational data.
The technical flaw within Oracle Net Services stems from insufficient input validation and authentication mechanisms that allow unauthenticated attackers to establish malicious connections. This vulnerability operates at the network protocol level, leveraging weaknesses in how Oracle Net Services processes incoming connection requests and authentication challenges. The attack vector specifically targets Oracle Net services which serve as the primary communication channel for database operations, making this a fundamental threat to database security architecture. The CVSS 3.1 score of 9.1 indicates high severity with both confidentiality and availability impacts rated as high, reflecting the potential for complete data compromise and service disruption.
The operational impact of successful exploitation encompasses two primary attack surfaces: unauthorized access to sensitive database information and complete denial of service conditions. Attackers can gain access to critical data through this vulnerability, potentially exposing confidential corporate information, financial records, personal data, or intellectual property that organizations rely on for business operations. The second major impact involves causing system instability through hang conditions or frequent crashes, which can result in complete service outages affecting business continuity and operational availability. This dual nature of impact makes the vulnerability particularly dangerous as it can simultaneously compromise data integrity and availability, creating cascading effects throughout enterprise systems that depend on Oracle database services.
Organizations should implement immediate mitigations including network segmentation to limit access to Oracle Net Services ports, deployment of network firewalls to restrict access to authorized IP addresses only, and implementation of intrusion detection systems to monitor for suspicious Oracle Net traffic patterns. The vulnerability aligns with CWE-284 (Improper Access Control) and CWE-310 (Cryptographic Issues) categories within the Common Weakness Enumeration framework, while also mapping to MITRE ATT&CK techniques involving initial access through network service exploitation and privilege escalation via database access. Regular patch management should be prioritized as Oracle has released security updates addressing this vulnerability, and organizations must ensure timely deployment of patches across all affected versions to prevent exploitation attempts that could result in significant financial and operational losses.