CVE-2026-91421

Analyzed Analyzed - Analysis Complete

Denial of Service in Siebel CRM Deployment

Publication date: 2026-10-20

Last updated on: 2026-11-04

Assigner: Oracle

Description

Vulnerability in the Siebel CRM Deployment product of Oracle Siebel CRM (component: Server Infrastructure). Supported versions that are affected are 17.0-26.9. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP to compromise Siebel CRM Deployment. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Siebel CRM Deployment. CVSS 3.1 Base Score 5.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).

CVSS Scores

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Meta Information

Published

2026-10-20

Last Modified

2026-11-04

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-91421

EUVD

EUVD-2026-106672

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	siebel_crm	From 17.0 (inc) to 26.9 (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 denial-of-service (DoS) vulnerability in Oracle Siebel CRM Deployment versions 17.0 to 26.9. An unauthenticated attacker can exploit it remotely via HTTP to cause the system to hang or crash repeatedly, making it unavailable.

Detection Guidance

This vulnerability is specific to Oracle Siebel CRM Deployment versions 17.0-26.9 and involves HTTP network access. Detection would require checking the installed version of Siebel CRM Deployment against the affected range. No specific commands are provided in the context to detect this issue.

Impact Analysis

If you use Oracle Siebel CRM Deployment versions 17.0 to 26.9, an attacker could disrupt your CRM services, leading to downtime and loss of access for users.

Compliance Impact

This vulnerability causes denial-of-service (DOS) conditions in Oracle Siebel CRM Deployment, leading to system unavailability. For GDPR, availability is a key principle, so prolonged outages could risk compliance. HIPAA requires safeguards for data availability; disruptions may impact protected health information access. However, the CVE does not specify data exposure or confidentiality loss.

Mitigation Strategies

Apply the latest Oracle Siebel CRM patches or updates for versions 17.0-26.9 to address the vulnerability in the Server Infrastructure component.

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EPSS Chart

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