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4:10pm, 13 July 2023

TLP Rating: Clear

Fortigate remote code execution vulnerability

A vulnerability has been discovered that affects FortiGate devices running FortiOS and FortiProxy.

This stack-based buffer overflow vulnerability allows for an attacker to run unauthorised code or commands remotely on the affected system.

The vulnerability is tracked as CVE-2023-33308.

What to look for

How to tell if you're at risk

All FortiGate devices running the following FortiOS and FortiProxy versions.

  • FortiOS version 7.2.0 through 7.2.3.
  • FortiOS version 7.0.0 through 7.0.10.
  • FortiProxy version 7.2.0 through 7.2.2.
  • FortiProxy version 7.0.0 through 7.0.9.

What to do


Upgrade your devices running FortiOS or FortiProxy to the latest version as soon as possible.

Please upgrade to:

  • FortiOS version 7.4.0 or above,
  • FortiOS version 7.2.4 or above,
  • FortiOS version 7.0.11 or above,
  • FortiProxy version 7.2.3 or above,
  • FortiProxy version 7.0.10 or above.


Disable HTTP/2 support on SSL inspection profiles used by proxy policies or firewall policies with proxy mode.

Example with custom-deep-inspection profile:

config firewall ssl-ssh-profile

edit "custom-deep-inspection"

set supported-alpn http1-1



For more information see the Fortigate page on HTTP/2 support in proxy mode.

HTTP/2 support in proxy mode SSL inspection | FortiGate / FortiOS 7.0.0 ( External Link

More information

Official information released by Fortinet will be available here:

PSIRT Advisories | FortiGuard External Link

If you require more information or further support, submit a report on our website or contact us on 0800 CERTNZ.

Report an incident to CERT NZ External Link