CVE-2026-83347
MediumCVSS 6.5Summary
Vulnerability in the Oracle Net Services component of Oracle Database Server, affecting versions 23.4.0-23.26.3. An unauthenticated attacker with network access via TCPS can exploit it, but human interaction is required. Successful attacks can cause a hang or frequently repeatable crash (complete DoS) of Oracle Net Services.
Risk Assessment
An attacker could cause a denial of service of Oracle Net Services, disrupting applications that depend on the database. Human interaction is required, which somewhat limits the risk, but it can still lead to service outages.
Recommendation
Apply the available Oracle security updates for Oracle Database Server. Restrict network access to TCPS and monitor for unusual connection attempts.
Other vulnerabilities in Oracle Net Services
See all- CVE-2026-83350High
Vulnerability in the Oracle Net Services component of Oracle Database Server affecting versions 21.3-21.23 and 23.4.0-23.26.3. An easily exploitable flaw allows an unauthenticated attacker with network access via Oracle Net to cause a hang or frequently repeatable crash (complete DOS).
- CVE-2026-83349High
Vulnerability in the Oracle Net Services component of Oracle Database Server affecting versions 19.3-19.32, 21.3-21.23 and 23.4.0-23.26.3. An easily exploitable flaw allows an unauthenticated attacker with network access via Oracle Net to cause a hang or frequently repeatable crash (complete DOS).
- CVE-2026-83333High
Vulnerability in the Oracle Net Services component of Oracle Database Server (versions 23.4.0-23.26.3). An unauthenticated attacker with network access via Oracle Net can easily exploit this flaw to cause a hang or frequent crashes (complete DoS) of Oracle Net Services. CVSS 7.5 (Availability impact).
- CVE-2026-47040Critical
Vulnerability in Oracle Net Services (part of Oracle Database Server) allows an unauthenticated attacker remote access to critical data and can cause a complete denial of service (DOS). CVSS score is 9.1.
Original NVD description (English source)
Vulnerability in the Oracle Net Services component of Oracle Database Server. Supported versions that are affected are 23.4.0-23.26.3. Easily exploitable vulnerability allows unauthenticated attacker with network access via TCPS to compromise Oracle Net Services. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Net Services. CVSS 3.1 Base Score 6.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).