CVE-2026-83347

Received Received - Intake

Denial of Service in Oracle Database Server

Publication date: 2026-09-15

Last updated on: 2026-09-18

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 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).

CVSS Scores

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Meta Information

Published

2026-09-15

Last Modified

2026-09-18

Generated

2026-10-06

AI Q&A

2026-09-16

EPSS Evaluated

2026-10-04

NVD

CVE-2026-83347

EUVD

EUVD-2026-79700

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 via TCPS to cause a denial of service (DOS) by crashing or hanging the service. The attack requires some interaction from a user other than the attacker.

Detection Guidance

This vulnerability affects Oracle Database Server versions 23.4.0 to 23.26.3 and can be exploited via TCPS network access. Detection requires checking the Oracle Database Server version and monitoring for unusual network activity or crashes in Oracle Net Services. No specific commands are provided in the context.

Impact Analysis

If exploited, this vulnerability could disrupt Oracle Database Server operations, leading to downtime and loss of availability for services relying on Oracle Net Services. This may affect database connectivity and application performance.

Compliance Impact

This vulnerability causes denial-of-service (DoS) conditions in Oracle Net Services, leading to service disruptions. Such disruptions may impact data availability, potentially violating compliance requirements for GDPR (data availability) and HIPAA (system availability for protected health information).

Mitigation Strategies

Apply the latest Oracle Critical Patch Update (CPU) for Oracle Database Server versions 23.4.0 to 23.26.3. Monitor Oracle's security advisories for patches. Restrict network access to TCPS ports used by Oracle Net Services. Disable unnecessary services and enforce strong authentication mechanisms.

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