Sophos discovered an XG Firewall v17.x vulnerability regarding access to physical and virtual units configured with the user portal exposed on the WAN. This was a previously unknown buffer overflow vulnerability in the user portal HTTP/S bookmark feature.

Sophos quickly responded and remediated with a hotfix that removes the HTTP/S bookmark functionality for all XG Firewalls running SFOS v17.x. XG Firewall v18 was not impacted.


Applies to the following Sophos product(s) and version(s)

  • Sophos XG Firewall v17.5 MR12 and earlier

  • You will receive an email from Sophos if any action is required



  • Ensure you are running a supported version of XG Firewall
  • Hotfix HF062020.1 was published for all firewalls running v17.x
  • Additionally, Sophos recommends that XG Firewall customers upgrade to SFOS v18


Sophos strongly recommends following industry best practices and the additional steps below to fully remediate the issue:

  1. Reset device administrator accounts
  2. Reset passwords for all local user accounts
  3. Disable User Portal access on the WAN unless necessary


Related information