---
id: "CVE-2026-101399"
kind: "vulnerability"
aliases: ["CVE-2026-101399"]
title: "Oracle Siebel CRM Marketing: unauthenticated SMTP request causes partial denial of service"
severity: "medium"
cvss: 5.3
epss: null
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["enterprise", "oracle-crm", "siebel", "vendor"]
not_affected_if: ["siebel-not-deployed"]
published_at: "2026-10-20T22:17:47+00:00"
first_seen_at: "2026-10-23T21:57:21+00:00"
updated_at: "2026-10-25T04:24:32+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-101399", "first_seen_at": "2026-10-23T21:57:21+00:00"}]
---

# Oracle Siebel CRM Marketing: unauthenticated SMTP request causes partial denial of service

Oracle Siebel CRM's Marketing component, versions 17.0 through 26.9, can be attacked over the network via SMTP without credentials. A successful attack causes a partial denial of service, making the Marketing application unavailable for some functions.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Confirm whether Siebel CRM Marketing is deployed and which version runs, `unknown` if the sources do not say how to read it
- Check whether the Marketing SMTP interface is reachable from the network, `unknown` if the sources do not say

## Fix

- Apply the Oracle Critical Patch Update that covers Siebel CRM Marketing, `unknown` for the exact patch version the sources do not name

## Timeline

- 2026-10-23T21:57:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-101399

## From the sources

Vulnerability in the Siebel Apps - Marketing product of Oracle Siebel CRM (component: Marketing).  Supported versions that are affected are 17.0-26.9. Easily exploitable vulnerability allows unauthenticated attacker with network access via SMTP to compromise Siebel Apps - Marketing.  Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Siebel Apps - Marketing. CVSS 3.1 Base Score 5.3 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_