Critical Fortigate VPN SSL Vulnerability – CVE-2022-42475

Updated on Tuesday 13, December – Affected versions.

Critical VPN SSL Vulnerability (FortiOS): Fortinet has just announced a critical vulnerability in all versions. Vulnerabilities that can be easily exploited remotely to compromise firewall or where remote code execution is considered likely in common situations. Manipulate the dynamic resources of some processes, the goal is to divert the working operation. The impact would be arbitrary code or execute unauthorized code or commands.


The highest severity issue fixed in this release is CRITICAL.

This vulnerability has a CVSS higher than 9. It’s already patched in the latest versions of FortiOS. Still, it’s not mentioned in their release notes. And the related PSIRT advisory from FortiGuardLabs is now publicly accessible. A heap-based buffer overflow vulnerability [CWE-122] in FortiOS SSL-VPN may allow a remote unauthenticated attacker to execute arbitrary code or commands via specifically crafted requests.


IR Number: FG-IR-22-398
Date: Dec 12, 2022
CVSSv3 Score: 9.3
Impact: Execute unauthorized code or commands
CVE ID: CVE-2022-42475

Affected versions:

  • FortiOS version 7.2.x to 7.2.2,
  • FortiOS version 7.0.x to 7.0.8,
  • FortiOS version 6.4.x to 6.4.10,
  • FortiOS version 6.2.x to 6.2.11,
  • FortiOS version 6.0.x to 6.0.15,
  • FortiOS version 5.6.x to 5.6.14,
  • FortiOS version 5.4.x to 5.4.13,
  • FortiOS version 5.2.x to 5.2.15,
  • FortiOS version 5.0.x to 5.0.14,
  • FortiOS-6K7K version 7.0.x to 7.0.7,
  • FortiOS-6K7K version 6.4.x to 6.4.9,
  • FortiOS-6K7K version 6.2.x to 6.2.11,
  • FortiOS-6K7K version 6.0.x to 6.0.14.



Prepare for immediate patching according to this way:

  • FortiOS version 7.2.x to 7.2.2: Downgrade to version 7.0.9 (care to the compatibility of news features in v7.2.x with 7.0.9 or upgrade to 7.2.3,
  • FortiOS version 7.0.x to 7.0.8: Upgrade to version 7.0.9,
  • FortiOS version 6.4.x to 6.4.10: Upgrade to version 6.4.11,
  • FortiOS version 6.2.x to 6.2.11: Upgrade to version 6.2.12.
  • FortiOS-6K7K version 7.0.x to 7.0.7: Upgrade to version 7.0.8,
  • FortiOS-6K7K version 6.4.x to 6.4.9: Upgrade to version 6.4.10?
  • FortiOS-6K7K version 6.2.x to 6.2.11: Upgrade to version 6.2.12,
  • FortiOS-6K7K version 6.0.x to 6.0.14: Upgrade to version 6.0.15.


Exploitation status:

Fortinet is aware of an instance where this vulnerability was exploited in the wild, and recommends immediately validating your systems against the following indicators of compromise:

Multiple log entries with:

Logdesc=”Application crashed” and msg=”[…] application:sslvpnd,[…], Signal 11 received, Backtrace: […]“

Presence of the following artifacts in the filesystem:


Connections to suspicious IP addresses from the FortiGate:,30081,30443,20443,444

All users of Fortigate should use this time to inventory instances of Fortigate and prepare for immediate patching when this is released. We recommend that you begin identifying your vulnerable systems now and prepare to patch (schedule a Task Force especially) soon as possible.


Organizations, users, get ready! We’ll keep you updated.


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