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CVE-2025-59718: Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
Fortinet Multiple Products · in CISA KEV since 2025-12-16
2025-12-16added to KEV
2025-12-23federal remediation due date
68.29%EPSS exploit probability (30 days) 99.3th percentile
9.8 CRITICALCVSS 3.1
Unknownknown ransomware use
7days from NVD publication to KEV
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.
Required action (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
| CWE | CWE-347 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD published | 2025-12-09 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2025-59718.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.