Improper Implementation in FortiProxy and FortiOS Affects User Security
CVE-2025-25255

Currently unrated

Key Information:

Vendor

Fortinet
Status
FortiOS
Fortiproxy
Vendor
CVE Published:
14 October 2025

What is CVE-2025-25255?

An improperly implemented security check in FortiProxy and FortiOS may allow authenticated proxy users to bypass domain fronting protection through crafted HTTP requests. Users relying on these products should be aware of the potential for security risks and consider applying relevant patches or updates to mitigate these vulnerabilities.

Affected Version(s)

FortiOS 7.6.0 <= 7.6.3

FortiProxy 7.6.0 <= 7.6.3

FortiProxy 7.4.0 <= 7.4.11

References

https://fortiguard.fortinet.com/psirt/FG-IR-24-372

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-25255 : Improper Implementation in FortiProxy and FortiOS Affects User Security