In CISA KEV9.1 CriticalCWE-347
CVE-2025-59718
Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
FortinetMultiple Products
Status
- Exploited in the wild
- In CISA KEV since 16 Dec 2025
- Vendor fix available
Federal deadlineTue 23 Dec 2025, 23:59 UTC
Passed 305 days ago
CISA KEV · added 16 Dec 2025
Exploit probabilityEPSSchecked 25 Oct
68%probability of exploitation in the next 30 days
Higher than 99% of scored CVEs
SeverityCVSS
9.1Critical
Description NVD
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.
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Coverage 8 articles · 5 outlets
See the full timelineShow as table
| Published (UTC) | Outlet | Headline |
|---|---|---|
| Thu 22 Jan · 11:20 UTC | Security Affairs | Arctic Wolf detects surge in automated Fortinet FortiGate firewall configuration attacks |
| Thu 22 Jan · 12:25 UTC | SecurityWeek | New Wave of Attacks Targeting FortiGate Firewalls |
| Thu 22 Jan · 21:41 UTC | Dark Reading | Fortinet Firewalls Hit With Malicious Configuration Changes |
| Fri 23 Jan · 05:20 UTC | SecurityOnline | “New” Path of Attack: Fully Upgraded Fortinet Devices Hit by SSO Exploits |
| Fri 23 Jan · 13:31 UTC | The Hacker News | Fortinet Confirms Active FortiCloud SSO Bypass on Fully Patched FortiGate Firewalls |
| Fri 23 Jan · 14:06 UTC | SecurityWeek | Fortinet Confirms FortiCloud SSO Exploitation Against Patched Devices |
| Fri 23 Jan · 19:16 UTC | Security Affairs | Fortinet warns of active FortiCloud SSO bypass affecting updated devices |
| Mon 26 Jan · 13:11 UTC | The Hacker News | ⚡ Weekly Recap: Firewall Flaws, AI-Built Malware, Browser Traps, Critical CVEs & More |
- ⚡ Weekly Recap: Firewall Flaws, AI-Built Malware, Browser Traps, Critical CVEs & MoreThe Hacker News
- Fortinet warns of active FortiCloud SSO bypass affecting updated devicesSecurity Affairs
- Fortinet Confirms FortiCloud SSO Exploitation Against Patched DevicesSecurityWeek
- Fortinet Confirms Active FortiCloud SSO Bypass on Fully Patched FortiGate FirewallsThe Hacker News
- “New” Path of Attack: Fully Upgraded Fortinet Devices Hit by SSO ExploitsSecurityOnline
- Fortinet Firewalls Hit With Malicious Configuration ChangesDark Reading
- New Wave of Attacks Targeting FortiGate FirewallsSecurityWeek
- Arctic Wolf detects surge in automated Fortinet FortiGate firewall configuration attacksSecurity Affairs · first in our coverage