---
id: CVE-2026-103994
title: "A Heap-based Buffer Overflow vulnerability in the\_VXLAN Gateway Daemon\_(vgd) of Juniper Networks Junos OS allows a malicious or compromised SDN-controller to cause a complete outage of the OVSDB control plane and possibly remote code exe…"
summary: "A Heap-based Buffer Overflow vulnerability in the\_VXLAN Gateway Daemon\_(vgd) of Juniper Networks Junos OS allows a malicious or compromised SDN-controller to cause a complete outage of the OVSDB control plane and possibly remote code exe…"
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
vendor: Juniper Networks
product: Junos OS
affected:
  - junos_os < 23.2R2-S7.7
  - junos_os >= 23.4 < 23.4R2-S8.13
  - junos_os >= 24.2 < 24.2R2-S5.5
  - junos_os >= 24.4 < 24.4R2-S5
  - junos_os >= 25.2 < 25.2R2-S2
  - junos_os >= 25.4 < 25.4R1-S3
  - junos_os >= 26.2 < 26.2R1-S2
published: '2026-10-14'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T16:24:19.073'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103994'
references:
  - url: 'https://supportportal.juniper.net/JSA112188'
    label: sirt@juniper.net
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-14T20:35:56.954373Z'
ingestedAt: '2026-10-14T17:44:53.672Z'
epss: 0.00429
epssPercentile: 0.37265
---

## Overview

A Heap-based Buffer Overflow vulnerability in the VXLAN Gateway Daemon (vgd) of Juniper Networks Junos OS allows a malicious or compromised SDN-controller to cause a complete outage of the OVSDB control plane and possibly remote code execution.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.