CVE-2026-85421: CWE-306: Missing Authentication for Critical Function in Brocade Brocade Active Support Connectivity Gateway
Description
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.
CVSS v4.0
Score 8.7high
Affected software
Brocade
Brocade Active Support Connectivity Gateway
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability identified as CVE-2026-85421 affects Brocade Active Support Connectivity Gateway (ASCG) versions prior to 3.5.0. The HTTPS service in these versions fails to properly enforce authentication or access control checks on incoming requests. As a result, an unauthenticated attacker with network access can send control commands, change cluster states, and modify system configurations. This flaw corresponds to CWE-306 (Missing Authentication for Critical Function) and has a CVSS 4.0 base score of 8.7, indicating high severity.
Potential Impact
An unauthenticated attacker with network access can fully control the streaming service control plane by issuing commands, altering cluster states, and modifying system configurations. This can lead to a complete compromise of the affected system's control functions.
Mitigation Recommendations
A fix is available in Brocade ASCG version 3.5.0 and later. Users should upgrade to version 3.5.0 or above to remediate this vulnerability. Since this is not a cloud service, remediation depends on applying the vendor's patch.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- brocade
- Date Reserved
- 2026-09-03T19:44:37.306Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ac73cd82cdf04f656f313eb
Added to database: 10/08/2026, 06:48:56 UTC
Last enriched: 10/08/2026, 07:03:49 UTC
Last updated: 10/09/2026, 06:48:20 UTC
Views: 17
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