Vulnerability in Fortinet Fortios

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…

EPSS: 0.095 (93.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: 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.

Affected products

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: .

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.

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2025-59718?
CVE-2025-59718 is a critical-severity vulnerability in Fortinet Fortios, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.1/10. Published 2025-12-09.
How severe is CVE-2025-59718?
Critical severity. CVSS v3 base score is 9.1 out of 10.
Is CVE-2025-59718 known to be exploited?
Yes. CVE-2025-59718 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-12-16), indicating it is being actively exploited. 2 public proof-of-concept repositories are indexed.