CVE detail
CVE-2025-59718: Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
Source: CISA Known Exploited Vulnerabilities catalog · back to feed
Vendor / product
Fortinet · Multiple Products
- Date added (KEV)
- Dec 16, 2025
- CISA due date
- Dec 23, 2025
- Ransomware campaign use
- Unknown
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.
Scorifya interpretation
AI-generatedA short, structured read of the record above, generated when this page first loads, then cached for a week.
Plain English
Technical detail
From CISA
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.
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
See what attackers can see on your domain
This vulnerability is on CISA's Known Exploited Vulnerabilities list, so it is being exploited in the wild right now. Scorifya can't test for Fortinet directly, but in about 30 seconds it shows what your own domain exposes publicly across TLS, security headers, DNS, and cookies: the surface attackers probe first.
SOC 2 compliance
Tracking remediation across your cloud infrastructure?
Scorifya Controls automates 54 SOC 2 checks across AWS, GitHub, GCP, and Azure, and gives you a manual evidence trail for the controls no tool can automate. Self-hosted, three tiers from $99/mo.
See Scorifya Controls →References
- https://fortiguard.fortinet.com/psirt/FG-IR-25-647Vendor Advisory
- https://arcticwolf.com/resources/blog/arctic-wolf-observes-malicious-sso-logins-following-disclosure-cve-2025-59718-cve-2025-59719/Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-864900.htmlThird Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59718US Government Resource
Other recent CVEs from Fortinet
- CVE-2026-25089FortiSandbox, Fortinet FortiSandbox OS Command Injection Vulnerability
- CVE-2026-39808FortiSandbox, Fortinet FortiSandbox OS Command Injection Vulnerability
- CVE-2026-21643FortiClient EMS, Fortinet FortiClient EMS SQL Injection Vulnerability
- CVE-2026-35616FortiClient EMS, Fortinet FortiClient EMS Improper Access Control Vulnerability
- CVE-2026-24858Multiple Products, Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability