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Actively exploited in the wild. This CVE is on the CISA Known Exploited Vulnerabilities list — treat remediation as urgent. Federal remediation due by 19 May 2025.
Fabric Operating SystemOperating system · Broadcom

CVE-2025-1976

MEDIUM · 6.7 CVSS v3.1 Published 2025-04-24
Fix available
A fix is available. Upgrade to 9.1.1d7 or later.
See remediation →
96/100
Remediation priority · Urgent
In the wild Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Brocade Fabric OS versions starting with 9.1.0 have root access removed, however, a local user with admin privilege can potentially execute arbitrary code with full root privileges on Fabric OS versions 9.1.0 through 9.1.1d6.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A local privilege escalation vulnerability in Brocade Fabric OS versions 9.1.0 through 9.1.1d6 allows a user with admin privileges to execute arbitrary code with full root privileges, bypassing the intended root access restrictions that were introduced in version 9.1.0.

MitigationUpgrade Fabric OS to a version beyond 9.1.1d6 that includes the security fix for this privilege escalation vulnerability.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Fabric Operating SystemOperating system
Affected:>= 9.1.0, < 9.1.1d7

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify Fabric OS version
    Execute the command to display the Fabric OS version, such as 'version' or 'firmwareShow' via admin CLI session
    Affected if The displayed version falls within the range 9.1.0 through 9.1.1d6 (i.e., version is >= 9.1.0 and < 9.1.1d7)
  2. Confirm admin user accounts exist
    List existing admin-level user accounts using 'userconfigshow' or equivalent admin CLI command
    Affected if Any admin-level user accounts are present on the system, as these accounts can potentially exploit the privilege escalation
  3. Verify root access status
    Attempt to check current user privileges using 'whoami' or 'id' command via admin CLI, or review if root-level shell access is unexpectedly available
    Affected if The system shows root-level privileges accessible to admin users, indicating the bypass of root access removal is present
  4. Check firmware revision detail
    If version shows 9.1.1, run 'firmwareShow' or 'version -detail' to confirm the exact build/revision (e.g., 9.1.1d6 or earlier)
    Affected if The specific build is 9.1.1d6 or earlier within the 9.1.x branch

The environment is affected if Fabric OS version is 9.1.0 through 9.1.1d6 and admin user accounts exist on the system, allowing authenticated admins to potentially escalate to full root privileges.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 9.1.1d7 or later
Fixed in 9.1.1d7
Interim mitigation

Upgrade Fabric OS to a version beyond 9.1.1d6 that includes the security fix for this privilege escalation vulnerability.

Recommended fix High confidence

Fabric OS 9.1.1d7 or later

  1. Identify the current Fabric OS version by running 'firmwareShow' or checking the admin interface
  2. Download the fixed Fabric OS version 9.1.1d7 (or later) from the Broadcom Support Portal at support.broadcom.com
  3. Review upgrade prerequisites in the Fabric OS upgrade guide, including backup requirements
  4. Upload the firmware using 'firmwareUpload' or the web management interface
  5. Execute the firmware install using 'firmwareInstall' command or via the web interface
  6. Verify the upgrade was successful and the system is running version 9.1.1d7 or later using 'firmwareShow'
  7. Confirm the vulnerability is remediated by verifying the version is now >= 9.1.1d7

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Fabric Operating System Exploited in the wild — priority engagement
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,120.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-1976 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data