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

4.8MEDIUM

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.

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Deploy the Patch

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

CVSS V3.1

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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