Hidden Backdoors in Fortinet Devices: How Symbolic Links Are Letting Hackers Stick Around

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In this episode of TechDaily.AI, we uncover a chilling new method used by cyber attackers to maintain persistent access inside Fortinet FortiGate firewalls—even after security patches are applied.

Recent findings reveal how symbolic links (or "symlinks") are being cleverly embedded within language folders tied to SSL VPN features, giving attackers a hidden backdoor into enterprise networks. These symlinks—essentially file shortcuts—can allow read-only access to sensitive configuration files, giving hackers a blueprint of your security setup and enabling long-term espionage.

We break down how this attack vector works, the CVEs being exploited (including CVE-2022-42475, CVE-2023-27997, and CVE-2024-21762), and why enabling SSL VPN on your devices could expose you to this threat. You'll learn:

How symbolic links help attackers persist post-patch
Why FortiGate firewalls and edge devices are prime targets
How read-only access can still leak critical data
The specific FortiOS versions that patch these vulnerabilities
Why just patching might not be enough to eliminate the threat
What immediate steps you should take—like disabling SSL VPN or performing a factory reset

We also discuss how attackers are adapting faster than ever, exploiting vulnerabilities within days of disclosure. This episode is a must-listen for security professionals, IT administrators, and CISOs looking to stay ahead of stealthy, persistent threats targeting edge devices.

🔐 Don’t miss the vital insights and practical recommendations that could help protect your infrastructure from these stealthy attacks.

👉 Sponsored by StoneFly.com – your trusted partner in enterprise data protection, cloud storage, and hyperconverged infrastructure.

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