CVE-2024-40766
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 · uneditedAn improper access control vulnerability has been identified in the SonicWall SonicOS management access, potentially leading to unauthorized resource access and in specific conditions, causing the firewall to crash. This issue affects SonicWall Firewall Gen 5 and Gen 6 devices, as well as Gen 7 devices running SonicOS 7.0.1-5035 and older versions.
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 confidenceThis is an improper access control vulnerability in the SonicWall SonicOS management interface that allows unauthorized resource access. Under specific conditions, the vulnerability can also cause the firewall to crash, potentially leading to denial of service. The flaw affects Gen 5 and Gen 6 firewall appliances, as well as Gen 7 devices running SonicOS versions 7.0.1-5035 and older.
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< 5.9.2.14-13o< 6.5.2.8-2n< 6.5.4.15.116n<= 7.0.1-5035CVSS 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 checksWork through these to decide whether this CVE applies to you.
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Identify SonicOS versionAccess the firewall management interface and navigate to System > Status or use the command line (ssh/console) and run 'show version' or 'get system status' to display the installed SonicOS versionAffected if The displayed version number is lower than 5.9.2.14-13o, 6.5.2.8-2n, 6.5.4.15.116n, or is 7.0.1-5035 or lower
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Confirm management interface is network-accessibleVerify that the SonicWall management interface (HTTPS on port 443, or HTTP on port 80) is listening on external/WAN interfaces. Check firewall access rules or run 'show interface' to identify which interfaces have management services enabledAffected if Management interface is bound to or accessible through WAN/external interfaces rather than only internal/LAN interfaces
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Check for unauthorized access indicatorsReview firewall logs for unusual management interface access patterns, particularly from unexpected IP addresses. Use 'show log' or access the Log Viewer in the management GUI to search for management authentication eventsAffected if There are authentication attempts or administrative actions from unauthorized sources in the logs, or if the management interface is exposed to the internet without VPN or IP restrictions
If the SonicWall device is running any version below 5.9.2.14-13o, 6.5.2.8-2n, 6.5.4.15.116n, or 7.0.1-5035 and its management interface is network-accessible (especially from WAN/external networks), the environment is affected by this vulnerability.
Generated from the published advisory. Verify against your own configuration.
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 · scoped5.9.2.14-13o6.5.2.8-2n6.5.4.15.116n
Upgrade affected SonicWall devices to a patched SonicOS version beyond 7.0.1-5035. As an interim compensating control, restrict management access to trusted internal networks or VPN connections only.
SonicOS 5.9.2.14-13o or later; 6.5.2.8-2n or later / 6.5.4.15.116n or later; 7.0.1-5036 or later (or latest 7.0.x/7.1.x stable release)
- 1. Identify the current SonicOS version by accessing the SonicWall management interface or running 'show version' via CLI.
- 2. Determine the firewall generation (Gen 5, Gen 6, or Gen 7) from the hardware model.
- 3. Download the appropriate fixed firmware from the official SonicWall support portal (my.sonicwall.com) matching your device generation: for Gen 5 use 5.9.2.14-13o or later; for Gen 6 use 6.5.2.8-2n or later (or 6.5.4.15.116n or later for 6.5.4 branch); for Gen 7 use 7.0.1-5036 or later, or the latest available 7.0.x/7.1.x release.
- 4. Backup the current firewall configuration from the management interface (Manage | Settings | Configuration | Backup).
- 5. Schedule a maintenance window as the upgrade will require a brief firewall reboot/downtime.
- 6. Upload the firmware file via the SonicWall management interface (Manage | Settings | Firmware | Upload) or via CLI using the firmware upgrade command.
- 7. After upload, initiate the firmware upgrade and allow the firewall to reboot.
- 8. Once the firewall restarts, verify the new SonicOS version matches the expected fixed version.
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation6.0 h
- Testing4.0 h
- Review / QA2.0 h
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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 sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-40766 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
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