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Brocade Fabric OS CVE-2026-87683

| EUVDEUVD-2026-94657 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-10-08 brocade GHSA-fmmw-9gq9-8xjm
8.6
CVSS 4.0 · Vendor: brocade
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Severity by source

Vendor (brocade) PRIMARY
8.6 HIGH
CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
8.0 HIGH

Adjacent management network (AV:A) and required low-priv REST API auth (PR:L); stack corruption in the management process yields high C/I/A with no scope change (S:U).

3.1 AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (brocade).

CVSS VectorVendor: brocade

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Oct 08, 2026 - 03:01 EUVD
Analysis Generated
Oct 08, 2026 - 01:57 vuln.today
CVE Published
Oct 08, 2026 - 01:07 cve.org
HIGH 8.6

DescriptionCVE.org

Multiple stack-based buffer overflow vulnerabilities exist in the REST API management component of Brocade Fabric OS versions prior to 10.0.1. When processing API request payloads (such as device configuration attributes or port mapping requests) the REST API service fails to properly validate incoming array counts and string lengths against internal buffer capacities. An authenticated attacker with REST API access can transmit crafted, oversized request parameters to induce memory corruption on the execution stack. This may result in a denial-of-service condition (daemon crash) or potential arbitrary code execution within the management process context.

AnalysisAI

Authenticated attackers with access to the adjacent management network can exploit stack-based buffer overflows in the REST API management component of Brocade Fabric OS versions prior to 10.0.1. By sending crafted API requests with oversized array counts or string lengths, an attacker can cause memory corruption, leading to a denial of service (daemon crash) or potentially arbitrary code execution within the management process. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Persist
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Vulnerability AssessmentAI

Exploitation Exploitation requires (1) network reachability to the switch's management plane (AV:A - adjacent, typically a segregated management/SAN admin network, not the open internet), and (2) valid low-privileged REST API credentials (PR:L - authenticated REST API access). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a credible, high-priority vulnerability for organizations running affected Brocade Fabric OS, but not an internet-facing emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: Fabric OS 10.0.1 (or later) resolves the stack-based buffer overflows in the REST API management component. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, inventory all Brocade Fabric OS deployments and confirm which run versions prior to 10.0.1, then restrict REST API management access to only the minimum necessary administrative hosts via ACLs and firewall rules on the adjacent management network, disable the REST API on any switch where it is not operationally required, and review REST API account entitlements to remove unused or over-privileged credentials. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-87683 vulnerability details – vuln.today

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