---
id: CVE-2026-87665
title: >-
  A stack-based buffer overflow vulnerability exists in the Internet Key
  Exchange (IKEv2) protocol handler on Brocade Fabric OS versions before 10.0.1
summary: >-
  A stack-based buffer overflow vulnerability exists in the Internet Key
  Exchange (IKEv2) protocol handler on Brocade Fabric OS versions before 10.0.1.
  The vulnerability occurs when processing initial IKE key exchange requests on
  extension…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-121
vendor: broadcom
product: fabric_operating_system
affected:
  - fabric_operating_system < 10.0.1
patched:
  - fabric_operating_system 10.0.1
published: '2026-10-08'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T17:24:29.240'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-87665'
references:
  - url: 'https://support.broadcom.com/external/content/SecurityAdvisories/0/39148'
    label: sirt@brocade.com
tags:
  - nvd
  - cve.org
epss: 0.00789
epssPercentile: 0.56032
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-08T13:19:43.186471Z'
scores:
  nvd: 7.5
  cna: 6
ingestedAt: '2026-10-08T04:04:32.113Z'
---

## Overview

A stack-based buffer overflow vulnerability exists in the Internet Key Exchange (IKEv2) protocol handler on Brocade Fabric OS versions before 10.0.1. The vulnerability occurs when processing initial IKE key exchange requests on extension switches or blades running IPsec-enabled Fibre Channel over IP (FCIP) circuits. An unauthenticated remote attacker can exploit this vulnerability by sending a single, specifically crafted UDP packet (Port 500) containing an oversized Nonce payload. Successful exploitation results in a denial of service (data-plane process crash)

## Affected

- `fabric_operating_system < 10.0.1`

## Remediation

Upgrade past the affected range:

- `fabric_operating_system 10.0.1`