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Email Security Appliance 5000 FirmwareOperating system · Sonicwall

CVE-2025-40604

CRITICAL · 9.8 CVSS v3.1 Published 2025-11-20
Fix available
A fix is available. Upgrade to after 10.0.33.8195 or later.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges 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
Download of Code Without Integrity Check Vulnerability in the SonicWall Email Security appliance loads root filesystem images without verifying signatures, allowing attackers with VMDK or datastore access to modify system files and gain persistent arbitrary code execution.

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 · high confidence

The SonicWall Email Security appliance loads root filesystem images (VMDK files) from the datastore without verifying cryptographic signatures, allowing attackers with datastore or VMDK access to replace legitimate images with malicious modified versions and achieve persistent arbitrary code execution with root privileges.

MitigationRestrict access to VMDK/datastore resources, implement strict network segmentation, and apply vendor patches to enable signature verification for filesystem images.

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
Email Security Appliance 5000 FirmwareOperating system
Affected:<= 10.0.33.8195
Email Security Appliance 5050 FirmwareOperating system
Affected:<= 10.0.33.8195
Email Security Appliance 7000 FirmwareOperating system
Affected:<= 10.0.33.8195
Email Security Appliance 7050 FirmwareOperating system
Affected:<= 10.0.33.8195
Email Security Appliance 9000 FirmwareOperating system
Affected:<= 10.0.33.8195

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
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/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. Check installed firmware version
    Access the appliance admin console or run 'fwupdmgr get-version' or check System > About page in the web UI. Compare the version number to 10.0.33.8195.
    Affected if The firmware version is 10.0.33.8195 or lower.
  2. Identify appliance model
    Verify the hardware model through the admin console (typically under System > Status or Hardware Information). Confirm it is one of: 5000, 5050, 7000, 7050, or 9000.
    Affected if The appliance is model 5000, 5050, 7000, 7050, or 9000 and the firmware is at or below the affected version.
  3. Determine if datastore/VMDK loading is configured
    Check the appliance configuration for datastore or VMDK image loading settings. This may appear under System > Update, Storage, or Datastore settings in the admin UI. Look for references to loading external VMDK images or datastore mounts.
    Affected if Datastore or VMDK loading is enabled or configured on the appliance.
  4. Inspect datastore access controls
    Review the datastore and VMDK file permissions and access logs. Determine whether the datastore storing VMDK images is accessible to untrusted users or network segments.
    Affected if The datastore containing VMDK images has broad or untrusted access, allowing potential file replacement.

A user is affected if they run a SonicWall Email Security Appliance (5000/5050/7000/7050/9000) with firmware at or below version 10.0.33.8195 and have datastore/VMDK loading configured, especially if the datastore lacks strict access controls.

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 a release after 10.0.33.8195
Interim mitigation

Restrict access to VMDK/datastore resources, implement strict network segmentation, and apply vendor patches to enable signature verification for filesystem images.

Recommended fix Moderate confidence

Firmware version > 10.0.33.8195 (obtain exact version from SonicWall PSIRT advisory)

  1. Identify the current firmware version running on the SonicWall Email Security Appliance by accessing the web management interface or using the CLI command 'version'
  2. Navigate to the SonicWall support portal at psirt.global.sonicwall.com to obtain the latest firmware version for your specific appliance model (5000, 5050, 7000, 7050, or 9000)
  3. Download the firmware version newer than 10.0.33.8195 that contains the security fix for CVE-2025-40604
  4. Upload the firmware image through the appliance's web interface under System Administration > Firmware Update, or via CLI using the 'firmware upgrade' command
  5. After upgrade, verify the new firmware version is installed and confirm the vulnerability is remediated
  6. Ensure VMDK and datastore access controls are reviewed and restricted to trusted administrators only as a defense-in-depth measure
Caveat Review SonicWall release notes for any configuration or feature changes between versions before upgrading

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

Fix this in Email Security Appliance 5000 Firmware Scoped from the published advisory
  • Consultation4.0 h
  • Implementation16.0 h
  • Testing8.0 h
  • Review / QA4.0 h
32.0 hours of engineering $5,600
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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-2025-40604 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