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CVE Record

CVE-2021-27792: The request handling functions in web management interface of Brocade Fabric OS versions before v9.0.1a, v8...

The request handling functions in web management interface of Brocade Fabric OS versions before v9.0.1a, v8.2.3a, and v7.4.2h do not properly handle malformed user input, resulting in a service crash. An authenticated attacker could use this weakness to cause the FOS HTTP application handler to crash, requiring a reboot.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-27792 can let an authenticated user crash the Brocade Fabric OS web management handler with malformed input. The failure requires a reboot, so the main business risk is management-plane disruption for Fibre Channel infrastructure, not data theft or code execution based on the provided sources.

Executive priority

Treat as a scheduled infrastructure reliability fix unless management interfaces are broadly reachable or shared administrator access is weak. Prioritize faster remediation for production SAN environments where reboot-driven management outages could affect operations.

Technical view

Brocade Fabric OS versions before v9.0.1a, v8.2.3a, and v7.4.2h mishandle malformed input in web management request handling. An authenticated attacker can trigger a FOS HTTP application handler crash. CVSS, CWE, and detailed vendor remediation text are not provided in the source bundle.

Likely exposure

Exposure is most likely where Brocade Fabric OS web management is enabled on versions before v9.0.1a, v8.2.3a, or v7.4.2h and reachable by authenticated users. Internet exposure is not stated in the sources.

Exploitation context

The CVE is not listed as KEV, and the provided sources do not report active exploitation. The described attack requires authentication and malformed input to the web management interface, causing a service crash that requires reboot.

Researcher notes

Available evidence supports authenticated denial of service against the FOS HTTP application handler. The bundle does not provide CVSS metrics, CWE classification, proof of exploitation, or detailed patch notes, so avoid claims beyond authenticated crash and reboot impact.

Mitigation direction

  • Upgrade Brocade Fabric OS to v9.0.1a, v8.2.3a, v7.4.2h, or later supported releases.
  • Restrict web management access to trusted administration networks and approved administrators.
  • Review Broadcom and NetApp advisories for platform-specific guidance.
  • Monitor management-plane crashes and unexpected reboot requirements until remediation is complete.

Validation and detection

  • Inventory Brocade switches and record Fabric OS versions.
  • Confirm affected branches meet or exceed v9.0.1a, v8.2.3a, or v7.4.2h.
  • Verify web management access is limited to approved administrator networks.
  • Review operational logs for FOS HTTP handler crashes or unexplained reboot needs.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-27792 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/aBrocade Fabric OSBrocade Fabric OS versions before v9.0.1a, and v8.2.3a, and v7.4.2hListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.