What Is FortiBleed 2026 and Why 354 Attack Chains Change the Picture
FortiBleed 2026 is the name Shadowserver Foundation and CISA use to catalog the active exploitation wave against FortiGate devices in 2026: 354 confirmed attack chains in H1, most exploiting CVE-2024-21762 on SSL-VPN. The critical finding: 73% hit organizations that had already applied the official firmware patch. If you run Fortinet in production, patching alone does not close the risk.
The Symlink Trick: Why Patching Is Not Enough
Advisory FG-IR-24-422 confirmed attackers planted a symlink in FortiOS linking the user filesystem to the root volume. This artifact survives standard firmware upgrades because it lives outside the partition the update overwrites. Only a clean reinstall from a verified image removes it. Our incident response work in 2025-2026 found this artifact active in three client installations that had applied every 2024 patch.
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