CVE-2025-59718
Fortinet Multiple Products
Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
What it is
Fortinet FortiOS, FortiSwitchMaster, FortiProxy, and FortiWeb contain an improper verification of cryptographic signature vulnerability that may allow an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML message. Please be aware that CVE-2025-59719 pertains to the same problem and is mentioned in the same vendor advisory. Ensure to apply all patches mentioned in the advisory.
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor notices and references
- fortiguard.fortinet.com/psirt/FG-IR-25-647
- docs.fortinet.com/upgrade-tool/fortigate
- nvd.nist.gov/vuln/detail/CVE-2025-59718
Description and required action as published by CISA. Full record at NVD.
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