CVE-2026-83349
HighCVSS 7.5Summary
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).
Risk Assessment
An attack can result in complete denial of service (DOS) of Oracle Net Services, impacting system availability. High risk to business continuity.
Recommendation
Immediately update Oracle Database Server to the version containing Oracle's fix. Restrict network access via Oracle Net and monitor service availability.
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-2026-83347Medium
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.
- 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 19.3-19.32, 21.3-21.23 and 23.4.0-23.26.3. 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 ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Net Services. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).