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For SonicWall SMA 1000 appliances, CVE-2026-102255 is fixed by installing a platform hotfix at or above the threshold for the appliance’s existing firmware branch. First record the full version, select the matching fixed build below, install the vendor hotfix through AMC, then verify the installed version after the appliance restarts.
Which SMA 1000 versions are affected?
SonicWall’s October 2026 notice covers SMA 1000 models 6210, 7210, and 8200v across all hypervisors. It identifies CVE-2026-102255 as a server-side request forgery (SSRF) vulnerability with a vendor-reported CVSS score of 10.0 (Critical). The same notice covers three other vulnerabilities: CVE-2026-102256 (remote code execution, CVSS 7.8 High), CVE-2026-102257 (Zip Slip path traversal, CVSS 7.2 High), and CVE-2026-102258 (stored cross-site scripting, CVSS 5.5 Medium). These findings apply to the SMA 1000 notice; do not treat them as an advisory for SMA 100, SonicOS firewalls, or other SonicWall products. SonicWall’s product notice was published October 5, 2026, and updated October 6, 2026.
| Firmware branch | Affected builds | Fixed threshold |
|---|---|---|
| 12.4.3 | 12.4.3-03526 and older | 12.4.3-03670 or higher |
| 12.5.0 | 12.5.0-02952 and older | 12.5.0-03082 or higher |
Use the full platform-hotfix version and compare it only with the threshold on the same branch. Do not compare build suffixes across branches. The thresholds above are those in the cited notice; check SonicWall’s current advisory for any later revisions before scheduling an update.
How to update a SonicWall SMA 1000
- Record the branch and full platform-hotfix build. In AMC, open Dashboard > System > System Information and note the displayed appliance version. Determine whether it is on branch 12.4.3 or 12.5.0, then use the table above to decide whether it is at an affected build or already at the fixed threshold.
- Obtain the appropriate vendor hotfix. Use an upgrade or hotfix link available in AMC, or download the recent upgrade or hotfix file for the registered device through MySonicWall. The public notice lists fixed version thresholds, not a package filename or checksum; use the vendor-provided file for your appliance and branch rather than relying on an assumed package name. SonicWall documents these acquisition options in its Secure Mobile Access 12.5 Upgrade Guide.
- Import and install the update in AMC. If you downloaded the file, go to System Configuration > Maintenance > System software updates, import it, select the update, and install it. If AMC presents the relevant upgrade or hotfix link, follow that path. The appliance restarts during the update, so plan the change for an appropriate maintenance window.
- Apply the platform hotfix before any client hotfix. SonicWall’s upgrade summary specifies that platform hotfixes should be applied before client hotfixes. If the hotfix set includes a related client update, install the applicable client update on endpoints as required by the release guidance; the appliance version check alone does not establish that endpoint updates have been applied.
- Verify the appliance after it restarts. Return to AMC’s Dashboard > System > System Information and compare the displayed platform-hotfix build with the fixed threshold for that branch. A branch-matching version at or above that threshold is the version outcome identified as fixed in SonicWall’s notice.
Where to verify versions in CMC or CMS
Centralized management has separate version checks. Verify the relevant managed appliance or management server in addition to the appliance check when your deployment uses those components; their console paths and displayed versions are distinct. SonicWall documents these locations in the upgrade summary.
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- CMC-managed appliance: In CMC, open Managed Appliances > Maintain > Maintain Appliances and inspect the appliance’s Version number. Compare it with the fixed threshold for that appliance’s branch.
- CMS: In CMC, open Management Server > Monitor > System Status and inspect the Version number in the System information section. Compare it with the fixed threshold applicable to that management server’s branch.
What to know about rollback and exposure
AMC can undo the most recent system update, but SonicWall warns that rollback erases configuration changes made since that update. Review the product-specific recovery guidance and consult SonicWall Support before rolling back a production appliance. SonicWall’s rollback instructions describe this consequence.
SonicWall’s October 2026 notice states: “IMPORTANT: There is no evidence that these vulnerabilities are being exploited in the wild.” This is the vendor’s assessment in that notice, not an independent confirmation that a particular appliance has not been compromised. The console version checks described above confirm installed version information; they are not an independent vulnerability scan or compromise assessment.
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