CISA Known Exploited Vulnerability
This vulnerability is actively exploited in the wild and listed in the CISA Known Exploited Vulnerabilities catalog.
Remediation Deadline: Dec 23, 2025
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.
EPSS — Exploit Probability
Higher than 83.4% of all CVEs
Required Action
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
Risk Assessment
ELEVATEDDetails
- Severity
- High
- EPSS
- 2.0%
- CISA KEV
- Yes
- Ransomware
- Unknown
- Articles
- 1
Timeline
Published
Dec 16, 2025
Added to KEV
Dec 16, 2025
Remediation Due
Dec 23, 2025