CVE-2025-59718
Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2025-12-16. Federal due date: 2025-12-23.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Fortinet | Fortiproxy | from 7.0.0 before 7.0.22 from 7.2.0 before 7.2.15 from 7.4.0 before 7.4.11 from 7.6.0 before 7.6.4 |
| Fortinet | Fortiswitchmanager | from 7.0.0 before 7.0.6 from 7.2.0 before 7.2.7 |
| Fortinet | Fortios | from 7.0.0 before 7.0.18 from 7.2.0 before 7.2.12 from 7.4.0 before 7.4.9 from 7.6.0 before 7.6.4 |
| Siemens | Ruggedcom Ape1808 Firmware | All versions |
Weakness classification
References
- NVD record
- CVE.org record
- CISA KEV catalog
- https://fortiguard.fortinet.com/psirt/FG-IR-25-647
- https://arcticwolf.com/resources/blog/arctic-wolf-observes-malicious-sso-logins-following-disclosure-cve-2025-59718-cve-2025-59719/
- https://cert-portal.siemens.com/productcert/html/ssa-864900.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59718