Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability — CVE-2024-55591

Summary

CVE-2024-55591 is a advisory from CISA-KEV. Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability Vendor: Fortinet. Severity/Threat: critical. This item is marked as actively exploited.

Product

FortiOS and FortiProxy

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Check logs/telemetry for indicators of compromise and suspicious activity.
• Consider temporary hardening: restrict access, reduce attack surface, and monitor aggressively.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

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