# CVE-2025-59718

## Summary

- **CVE ID:** CVE-2025-59718
- **Severity:** CRITICAL
- **CVSS Score:** 9.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C)
- **CWE:** CWE-347
- **Published:** Dec 9, 2025
- **Last Modified:** Aug 11, 2026

## Description

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.

## Affected Products

- Fortinet — FortiOS (7.6.0)
- Fortinet — FortiOS (7.4.0)
- Fortinet — FortiOS (7.2.0)
- Fortinet — FortiOS (7.0.0)
- Fortinet — FortiProxy (7.6.0)
- Fortinet — FortiProxy (7.4.0)
- Fortinet — FortiProxy (7.2.0)
- Fortinet — FortiProxy (7.0.0)
- Fortinet — FortiSwitchManager (7.2.0)
- Fortinet — FortiSwitchManager (7.0.0)

## References

- [CNA](https://fortiguard.fortinet.com/psirt/FG-IR-25-647)
- [CISA-ADP](https://arcticwolf.com/resources/blog/arctic-wolf-observes-malicious-sso-logins-following-disclosure-cve-2025-59718-cve-2025-59719/)
- [CISA-ADP](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59718)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-864900.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 68.29%
- **EPSS Percentile:** 99.3

## Known Exploited Vulnerabilities (KEV)

- **Date Added:** Dec 16, 2025
- **Due Date:** Dec 23, 2025

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._