CVE-2025-59718

critical Fortinet ⚠️ CISA KEV — Exploited in the Wild
CVSS v3 Base Score
9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
EPSS Score
63.4%
Exploitation probability in 30 days
Top 1% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: December 9, 2025 (271 days ago)
Last Modified: August 11, 2026
Vendor: Fortinet
Source: MITRE

⚠️ CISA Known Exploited Vulnerability

Added to KEV: 2025-12-16
Remediation Due: 2025-12-23 (⚠ 257d overdue)

Description

A improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiProxy 7.6.0 through 7.6.3, FortiProxy 7.4.0 through 7.4.10, FortiProxy 7.2.0 through 7.2.14, FortiProxy 7.0.0 through 7.0.21, FortiSwitchManager 7.2.0 through 7.2.6, FortiSwitchManager 7.0.0 through 7.0.5 allows an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML response message.

CWE

CWE-347

Affected Products

Fortinet FortiSwitchManagerFortinet FortiOSFortinet FortiProxy

References

🔗 fortiguard.fortinet.com