Brocade ASCG: Missing authentication in administrative management service
Summary
Brocade Active Support Connectivity Gateway (ASCG) contains an authentication flaw in its administrative management service. An unauthenticated network user can send direct API requests to read sensitive system configuration data, change managed device inventories and alter operational settings. Exploitation requires only network reachability of the management service and no user interaction.
Affected
- Brocade ASCG all versions before 3.5.0
- Vendor advisory states all versions before 3.5.0 are affected; some sources mention up to 3.4.x
Fixed in
- Brocade ASCG 3.5.0 (security update)
- Whether a backport or hotfix exists for older branches is unknown.
Workaround
- No vendor workaround confirmed. Unknown until the Broadcom advisory is reviewed.
- Restrict access to the ASCG management interface to a dedicated administration network.
Exploitation
- CISA SSVC: exploitation none, not automatable, total technical impact.
- Not listed in CISA KEV; no public exploit or proof of concept found.
- EPSS 0.00215 at time of research.
Our recommendation
- Check whether Brocade ASCG is deployed in your environment; if not, no action needed.
- Confirm the installed version and upgrade to 3.5.0 as a priority.
- Ensure the management interface is not reachable from user or internet networks.
- Review logs for unexpected API requests to the ASCG management service.
- Verify the details against the Broadcom advisory, as version information came from third-party mirrors.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Broadcom Security Advisory (Unauthenticated Administrative REST API Access in Brocade ASCG before 3.5.0) support.broadcom.com
- Broadcom support notice (ASCG 3.5.0 security update) support.broadcom.com
- VulDB CVE-2026-85489 vuldb.com
- CIRCL/Vulners CVE-2026-85489 vulners.com
- PSIRT CVE-2026-85489 psirt.com
- ACN Italy: Brocade vulnerabilities resolved www.acn.gov.it
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 1 Nov 2026, 05:21.
Original description (NVD)
An authentication flaw exists in the Brocade ASCG administrative management service component. An unauthenticated network user can issue direct API requests to perform privileged actions, including accessing sensitive system configuration mapping data, modifying managed device inventories, and altering operational settings. This vulnerability affects all versions of Brocade ASCG before 3.5.0.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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