CVE-2025-59718 — Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
2025-12-16 • CISA Known Exploited Vulnerability
[event] 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.
> AFFECTED SOFTWARE
| Field | Value |
|---|---|
| Vendor | Fortinet |
| Product | Multiple Products |
| CWE | CWE-347 |
| CVE ID | CVE-2025-59718 |
| Date Added | 2025-12-16 |
| Due Date | 2025-12-23 |
| Ransomware Campaign | Unknown |
> MITIGATION
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Due Date: 2025-12-23