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CVE-2025-59718

Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability

  • Critical 9.1
  • Exploited: added to CISA KEV 16 Dec 2025

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.

Key facts

Published
9 Dec 2025
Last changed
15 Oct 2026
Assigned by
fortinet
KEV added
16 Dec 2025
KEV fix due
23 Dec 2025
EPSS
68.087% likely to be exploited in the next 30 days, higher than 99.338% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: yes; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 9.1CVSS 3.1, Criticalfrom the CNA (fortinet)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

What to do

  • Upgrade to FortiSwitchManager version 7.2.7 or above Upgrade to FortiSwitchManager version 7.0.6 or above Upgrade to FortiProxy version 7.6.4 or above Upgrade to FortiProxy version 7.4.11 or above Upgrade to FortiProxy version 7.2.15 or above Upgrade to FortiProxy version 7.0.22 or above Upgrade to FortiOS version 7.6.4 or above Upgrade to FortiOS version 7.4.9 or above Upgrade to FortiOS version 7.2.12 or above Upgrade to FortiOS version 7.0.18 or above Upgrade to FortiWeb version 8.0.1 or above Upgrade to FortiWeb version 7.6.5 or above Upgrade to FortiWeb version 7.4.10 or above Fortinet remediated this issue in FortiSASE version 25.3.b and hence customers do not need to perform any action. Upgrade to FortiPAM version 1.8.0 or aboveCNA solution statement
  • Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
FortinetFortiSwitchManager
  • Default status: unaffected
  • 7.2.0 up to and including 7.2.6 (affected)
  • 7.0.0 up to and including 7.0.5 (affected)
FortinetFortiOS
  • Default status: unaffected
  • 7.6.0 up to and including 7.6.3 (affected)
  • 7.4.0 up to and including 7.4.8 (affected)
  • 7.2.0 up to and including 7.2.11 (affected)
  • 7.0.0 up to and including 7.0.17 (affected)
FortinetFortiProxy
  • Default status: unaffected
  • 7.6.0 up to and including 7.6.3 (affected)
  • 7.4.0 up to and including 7.4.10 (affected)
  • 7.2.0 up to and including 7.2.14 (affected)
  • 7.0.0 up to and including 7.0.21 (affected)

Timeline

  1. 9 Dec 2025 Published
  2. 16 Dec 2025 CVE-2025-59718 added to CISA KEV
  3. 16 Dec 2025 Added to the CISA KEV catalogue

Weakness

References