CRITICAL CISA KEV

CVE-2025-59718

Q: What is CVE-2025-59718?

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.

Q: Is CVE-2025-59718 actively exploited?

Yes. CVE-2025-59718 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2025-12-23.

Q: What is the CVSS score for CVE-2025-59718?

CVE-2025-59718 has a CVSS v3 base score of 9.8 (CRITICAL severity).

CVSS v3

9.8

CRITICAL

EPSS Score

68.3 %

exploit probability, as of 2026-10-19

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-25-135-01 CISA1 known affected
Siemens RUGGEDCOM APE1808 Devices
RUGGEDCOM APE1808
SSA-864900 Siemens ProductCERT1 known affected
SSA-864900: Multiple Vulnerabilities in Fortigate NGFW before V7.6.6 on RUGGEDCOM APE1808 Devices
RUGGEDCOM APE1808 with Fortinet NGFW < V7.4.9

Full record on NVD

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.

CISA Known Exploited Vulnerability

Date Added: 2025-12-16
Patch Due Date: 2025-12-23
Ransomware Use: Unknown

Technical details

Published: 2025-12-09

Frequently asked questions

What is CVE-2025-59718?

Is CVE-2025-59718 actively exploited?

Yes. CVE-2025-59718 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2025-12-23.

What is the CVSS score for CVE-2025-59718?

CVE-2025-59718 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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