December 16, 2025 By Pierluigi Paganini
Threat actors are exploiting two critical Fortinet flaws, tracked as CVE-2025-59718 and CVE-2025-59719, days after patch release, impacting multiple Fortinet products.
Threat actors started exploiting two critical flaws, tracked as CVE-2025-59718 and CVE-2025-59719 (CVSS score of 9.1), in Fortinet products days after patch release, Arctic Wolf warns.
Last week, Fortinet addressed 18 vulnerabilities, including the two flaws CVE-2025-59718 and CVE-2025-59719, affecting FortiOS, FortiWeb, FortiProxy, and FortiSwitchManager when FortiCloud SSO is enabled.
Both vulnerabilities are improper verification of cryptographic signature issues.
An improper signature-verification flaw in FortiOS, FortiWeb, FortiProxy, and FortiSwitchManager lets an unauthenticated attacker bypass FortiCloud SSO login using a crafted SAML message, if the feature is enabled. FortiCloud SSO is disabled by default, but it activates automatically during FortiCare registration unless the admin disables the “Allow administrative login using FortiCloud SSO” toggle.
Below are the impacted versions:
| Version | Affected | Solution |
|---|---|---|
| FortiOS 7.6 | 7.6.0 through 7.6.3 | Upgrade to 7.6.4 or above |
| FortiOS 7.4 | 7.4.0 through 7.4.8 | Upgrade to 7.4.9 or above |
| FortiOS 7.2 | 7.2.0 through 7.2.11 | Upgrade to 7.2.12 or above |
| FortiOS 7.0 | 7.0.0 through 7.0.17 | Upgrade to 7.0.18 or above |
| FortiOS 6.4 | Not affected | Not Applicable |
| FortiProxy 7.6 | 7.6.0 through 7.6.3 | Upgrade to 7.6.4 or above |
| FortiProxy 7.4 | 7.4.0 through 7.4.10 | Upgrade to 7.4.11 or above |
| FortiProxy 7.2 | 7.2.0 through 7.2.14 | Upgrade to 7.2.15 or above |
| FortiProxy 7.0 | 7.0.0 through 7.0.21 | Upgrade to 7.0.22 or above |
| FortiSwitchManager 7.2 | 7.2.0 through 7.2.6 | Upgrade to 7.2.7 or above |
| FortiSwitchManager 7.0 | 7.0.0 through 7.0.5 | Upgrade to 7.0.6 or above |
| FortiWeb 8.0 | 8.0.0 | Upgrade to 8.0.1 or above |
| FortiWeb 7.6 | 7.6.0 through 7.6.4 | Upgrade to 7.6.5 or above |
| FortiWeb 7.4 | 7.4.0 through 7.4.9 | Upgrade to 7.4.10 or above |
| FortiWeb 7.2 | Not affected | Not Applicable |
| FortiWeb 7.0 | Not affected | Not Applicable |