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CVE-2025-40604

SonicWall Email Security - Appliance Root Filesystem

SonicWall CVSS 9.8 Updated April 6, 2026

Executive Risk Summary

"A vulnerability in the SonicWall Email Security appliance allows attackers with VMDK or datastore access to modify system files and gain persistent arbitrary code execution. This is due to the appliance loading root filesystem images without verifying signatures, which can lead to a complete system compromise."

Anticipated Attack Path

  1. 1. Initial Access: Attacker gains access to the VMDK or datastore
  2. 2. Privilege Escalation: Attacker modifies system files to gain elevated privileges
  3. 3. Persistence: Attacker achieves persistent arbitrary code execution on the appliance

Am I Vulnerable?

  • Verify the integrity of system files on the SonicWall Email Security appliance
  • Restrict access to the VMDK and datastore to authorized personnel only
  • Apply the patch provided by SonicWall as soon as possible

Operational Audit Arsenal

Target Type Appliance
Target Asset SonicWall Email Security
Standard Path https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2025-0018

Manual Verification Required

This is a non-Windows asset (SonicWall). Use the target asset details and official path provided above to verify your current version against the official vendor advisories listed below.

Patch Impact Forecast

Reboot Required Likely

Potential disruption to email security services during the patching process

Internal Work Notes

CVE-2025-40604: SonicWall Email Security appliance vulnerability allowing arbitrary code execution. Apply patch SNWLID-2025-0018 and restrict access to VMDK and datastore.

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Intelligence Sources

Related SonicWall Threats

Data compiled from NVD, MSRC, and CISA KEV Catalog. Intelligence synthesized via AI. Scripts provided for diagnostic purposes under MIT License.