CVE-2026-83333

Received Received - Intake

Oracle Net Services Denial of Service Vulnerability

Publication date: 2026-09-15

Last updated on: 2026-09-16

Assigner: Oracle

Description

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 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).

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-15

Last Modified

2026-09-16

Generated

2026-10-06

AI Q&A

2026-09-16

EPSS Evaluated

2026-10-04

NVD

CVE-2026-83333

EUVD

EUVD-2026-79686

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	database_server	From 23.4.0 (inc) to 23.26.3 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-400	The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

Executive Summary

This is a vulnerability in Oracle Net Services, part of Oracle Database Server versions 23.4.0 to 23.26.3. It allows an unauthenticated attacker with network access to cause a denial of service (DOS) by crashing or hanging Oracle Net Services repeatedly.

Detection Guidance

Detection requires monitoring Oracle Net Services for crashes or hangs. Check Oracle alert logs for repeated crashes in the network service. Use Oracle Enterprise Manager to monitor service availability. Network traffic analysis tools like Wireshark can detect unusual patterns targeting Oracle Net ports (default 1521).

Impact Analysis

An attacker could exploit this to disrupt database operations, causing downtime and preventing legitimate users from accessing the database. This impacts availability of critical services relying on Oracle Database Server.

Compliance Impact

This vulnerability causes denial-of-service (DoS) conditions in Oracle Net Services, leading to system unavailability. Such disruptions may violate availability requirements in GDPR (Article 32) and HIPAA (Security Rule 164.312), potentially resulting in non-compliance due to impaired access to critical data.

Mitigation Strategies

Apply the latest Oracle Critical Patch Update for Oracle Database Server versions 23.4.0 to 23.26.3. Ensure Oracle Net Services is updated to a patched version to prevent denial of service attacks.

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