---
title: "CVE-2026-103408: Juniper Networks Session Smart Router - Remote Code Execution"
description: "Juniper Networks Session Smart Router contains a stack buffer overflow caused by improper handling of DHCP replies in the DHCP client, letting unauthenticated local attackers execute remote code."
url: https://panop.io/threat-heartbeat/CVE-2026-103408/
---

# CVE-2026-103408 Juniper Networks Session Smart Router - Remote Code Execution

Juniper Networks Session Smart Router contains a stack buffer overflow caused by improper handling of DHCP replies in the DHCP client, letting unauthenticated local attackers execute remote code.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-103408)

## Details

Type

Remote Code Execution

Impact

Remote Code Execution

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

28 October 2026

Updated

29 October 2026

Weakness

[CWE-121](https://cwe.mitre.org/data/definitions/121.html)

## Vendor fix

Update to the latest version of Juniper Networks Session Smart Router.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-103408](https://nvd.nist.gov/vuln/detail/CVE-2026-103408)
- [https://supportportal.juniper.net/JSA112183](https://supportportal.juniper.net/JSA112183)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

[Book a demo](https://panop.io/demo)