How severe is CVE-2025-59718?

CVE-2025-59718 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2025-59718?

Affected package information for CVE-2025-59718 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2025-59718?

No fixed version has been published for CVE-2025-59718 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2025-59718 actively exploited in the wild?

Yes. There are 2 known exploit references for CVE-2025-59718, including . All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

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

CVE-2025-59718 has an EPSS (Exploit Prediction Scoring System) score of 12.1%, placing it in the 94th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score warrants monitoring and prompt remediation.

Is CVE-2025-59718 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2025-59718 (Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2025-12-16. CISA required all US federal civilian agencies to remediate this vulnerability by 2025-12-23. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2025-59718?

CVE-2025-59718 is classified as CWE-347 (CWE-347). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2025-59718?

CVE-2025-59718 affects fortinet fortios; fortinet fortiproxy; fortinet fortiswitchmanager; siemens ruggedcom ape1808 firmware. Check the affected-products list on this page against your deployed version to confirm exposure.

When was CVE-2025-59718 published, and has it been updated?

CVE-2025-59718 was published on December 9, 2025 and was last updated on June 9, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2025-12-16 — agencies required to remediate by 2025-12-23

CVE-2025-59718

CRITICAL

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…

Published

Dec 9, 2025

Updated

Jun 9, 2026

Affected

0 pkgs

Patched

None yet

Exploits

2 known

EPSS Exploitation Probability

via FIRST.org ↗

12.1%probability of exploitation in next 30 days

Moderate Risk94th percentile+2.58%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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

4 products · 11 configurations

fortiosfortinet

≥ 7.6.0 && < 7.6.4

range

Application

fortiproxyfortinet

≥ 7.6.0 && < 7.6.4

range

Application

fortiswitchmanagerfortinet

≥ 7.2.0 && < 7.2.7

range

ruggedcom ape1808 firmwaresiemens

all

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

exfil0/CVE-2025-59718-PoC

Fortinet announced two closely related authentication‑bypass vulnerabili

⭐ 5🍴 5Feb 2026

moften/CVE-2025-59718-Fortinet-Poc

PoC para determinar si Fortinet es vulnerable a CVE-2025-59718 / CVE-202

⭐ 3🍴 0Mar 2026

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2025-59718 in your stack?

O3 detects CVE-2025-59718 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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