CVEvulnerability

CVE-2025-59718

9.8 CRITICAL Known exploited Published 2025-12-09 Modified 2026-06-17 Official page ↗

CISA Known Exploited Vulnerability

Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability — Fortinet Multiple Products

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.

Added to KEV
2025-12-16
Remediation due
2025-12-23
Ransomware 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.
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
Status
Analyzed
Published
2025-12-09
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-347

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 configurations

• fortinet fortiproxy (>= 7.0.0 < 7.0.22) • fortinet fortiproxy (>= 7.2.0 < 7.2.15) • fortinet fortiproxy (>= 7.4.0 < 7.4.11) • fortinet fortiproxy (>= 7.6.0 < 7.6.4) • fortinet fortiswitchmanager (>= 7.0.0 < 7.0.6) • fortinet fortiswitchmanager (>= 7.2.0 < 7.2.7) • fortinet fortios (>= 7.0.0 < 7.0.18) • fortinet fortios (>= 7.2.0 < 7.2.12) • fortinet fortios (>= 7.4.0 < 7.4.9) • fortinet fortios (>= 7.6.0 < 7.6.4) • siemens ruggedcom ape1808 firmware

Related

Weakness · CWE (1)

  • CWE-347 Improper Verification of Cryptographic Signature weakness

References