---
id: CVE-2026-103411
title: >-
  Session Smart Router: A malicious DHCP server causes information disclosure
  and a service crash during DHCP option parsing
summary: >-
  An Integer Underflow vulnerability in DhcpMessageDecoder in Juniper Networks
  Session Smart Router allows an attacker with local network access to cause
  information disclosure and a denial of service via a malicious DHCP reply.
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-191
vendor: Juniper Networks
product: Session Smart Router
affected:
  - session_smart_router < 7.0.5
  - session_smart_router >= 7.1.0 < 7.1.7
  - session_smart_router >= 7.2.0 < 7.2.3
published: '2026-10-28'
updated: '2026-10-28'
sourceUpdated: '2026-10-28T16:37:35.468Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-103411'
references:
  - url: 'https://supportportal.juniper.net/JSA112183'
tags:
  - cve.org
ingestedAt: '2026-10-28T17:14:44.468Z'
---

## Overview

An Integer Underflow vulnerability in DhcpMessageDecoder in Juniper Networks Session Smart Router allows an attacker with local network access to cause information disclosure and a denial of service via a malicious DHCP reply.

## Affected

- `session_smart_router < 7.0.5`
- `session_smart_router >= 7.1.0 < 7.1.7`
- `session_smart_router >= 7.2.0 < 7.2.3`

## Remediation

The following software releases of Session Smart Router have been updated to resolve these specific issues:
  *  7.0.5 

and all subsequent releases;
  *  7.1.7 

and all subsequent releases;
  *  7.2.3 and all subsequent releases.

### Workarounds

There are no known workarounds for this issue.