Is It On KEV?

Fortinet Multiple Products

YES - ON THE CISA KEV LIST
CVE-2025-59718

Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability

CISA catalog due date2025-12-23
323 days past due
EPSS exploit probability (next 30 days)68.1% · 99percentile
From CVE publication to KEV listing7 days (2025-12-09 → 2025-12-16)
Remediation window (KEV listing to due date)7 days
Days on the KEV list330 days
Date added to KEV2025-12-16
Known ransomware campaign useUnknown
VendorFortinet
ProductMultiple Products
Weaknesses (CWE)CWE-347

Fortinet: 32 entries (1.8% of all KEV entries are from this vendor); 9 added in 2026.

BOD 26-04 note: this is the date printed in the CISA catalog. A federal agency's actual deadline is set by its SSVC tier - Act (3 days), Attend (14 days), Track (60 days), or the next scheduled upgrade - counted from the KEV listing date or the date the vulnerability is identified in its environment, whichever comes first. Use the tier helper on each CVE page for your own window.

Your BOD 26-04 window (SSVC tier helper)

Your remediation window ends:

Description

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.

Notes

https://fortiguard.fortinet.com/psirt/FG-IR-25-647 ; https://docs.fortinet.com/upgrade-tool/fortigate ; https://nvd.nist.gov/vuln/detail/CVE-2025-59718

References

Other KEV entries for this vendor: Fortinet

Fortinet - Vendors with KEV entries

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