ZDI-CAN-28211: ZDI-25-1094: Fortinet FortiWeb ApacheCookie_parse Improper Verification of Cryptographic Signature Authentication Bypass Vulnerability
Published Dec 16, 2025
·Updated
This vulnerability allows remote attackers to bypass authentication on affected installations of Fortinet FortiWeb. Authentication is not required to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.1. The following CVEs are assigned: CVE-2025-64447.
Affected Software
1 affected component
Fortinet FortiWeb
Event History
Dec 16, 2025
Advisory Published
via ZDI·06:00 AM
Data Sourced
via ZDI·06:00 AM
Description
Frequently Asked Questions
1
What is the severity of ZDI-CAN-28211?
The severity of ZDI-CAN-28211 is rated 8.1 on the CVSS scale.
2
How do I fix ZDI-CAN-28211?
To fix ZDI-CAN-28211, update your Fortinet FortiWeb to the latest version provided by Fortinet.
3
What type of vulnerability is ZDI-CAN-28211?
ZDI-CAN-28211 is an authentication bypass vulnerability.
4
Who is affected by ZDI-CAN-28211?
ZDI-CAN-28211 affects installations of Fortinet FortiWeb software.
5
Can ZDI-CAN-28211 be exploited remotely?
Yes, ZDI-CAN-28211 can be exploited by remote attackers without needing authentication.