---
id: CVE-2026-85421
title: >-
  A critical security vulnerability has been identified in Brocade ASCG versions
  before 3.5.0
summary: >-
  A critical security vulnerability has been identified in Brocade ASCG versions
  before 3.5.0. The HTTPS service fails to properly enforce authentication or
  access control checks on incoming requests. An unauthenticated attacker with
  netwo…
severity: high
cvss: 8.7
cvssVector: 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-306
vendor: Brocade
product: Brocade Active Support Connectivity Gateway
affected:
  - active_support_connectivity_gateway < 3.5.0
published: '2026-10-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T06:16:11.177Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-85421'
references:
  - url: 'https://support.broadcom.com/external/content/SecurityAdvisories/0/38378'
tags:
  - cve.org
ingestedAt: '2026-10-08T07:18:54.847Z'
---

## Overview

A critical security vulnerability has been identified in Brocade ASCG versions before 3.5.0. The HTTPS service fails to properly enforce authentication or access control checks on incoming requests. An unauthenticated attacker with network access can issue control commands, alter cluster states, and modify system configurations, leading to a complete compromise of the streaming service control plane.

## Affected

- `active_support_connectivity_gateway < 3.5.0`

## Remediation

Security update provided in Brocade ASCG 3.5.0