CVE-2025-59718
CriticalExploitedPublic exploitA 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…
Published Dec 10, 2025 · Updated Oct 15, 2026 · Also known as TR-25-0437
Key Facts
Patch immediately- CVE-2025-59718 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Fortiproxy (Fortinet), Fortiswitchmanager (Fortinet), Fortios (Fortinet) and 1 more product.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 15, 2025 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 68% probability of exploitation in the next 30 days.
- Fixed versions are available, including Fortios 7.0.18, Fortiproxy 7.0.22, Fortiswitchmanager 7.0.6.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
68%
Higher than 99.3% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2025-59718 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Dec 16, 2025 | Dec 23, 2025 | Not reported |
| Industry KEV feed | Dec 15, 2025 | Dec 23, 2025 | Known |
| CIRCL KEV | Dec 16, 2025 | Dec 23, 2025 | Not reported |
| ENISA EUVD | Dec 16, 2025 | n/a | Not reported |
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.
Affected Products
112 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| FortiproxyFortinet | 7.0.0, 7.0.1, 7.0.10, 7.0.11, 7.0.12, 7.0.13, 7.0.14, 7.0.15 | 7.0.22 |
| FortiswitchmanagerFortinet | 7.0.0, 7.0.1, 7.0.2, 7.0.3, 7.0.4, 7.0.5, 7.2.0, 7.2.1 | 7.0.6 |
| FortiosFortinet | 7.0.0, 7.0.1, 7.0.10, 7.0.11, 7.0.12, 7.0.13, 7.0.14, 7.0.15 | 7.0.18 |
| Ruggedcom Ape1808 FirmwareSiemens | See advisory | n/a |
Patched Releases
Fortios
7.0.18
Fortiproxy
7.0.22
Fortiswitchmanager
7.0.6
Timeline
Publicly disclosed
Dec 10, 2025
Added to Industry KEV feed
Dec 15, 2025
Added to CISA KEV
Dec 16, 2025
Added to CIRCL KEV
Dec 16, 2025
Added to ENISA EUVD
Dec 16, 2025
Last updated
Oct 15, 2026
Weakness Type
- CWE-347 Improper Verification of Cryptographic Signature
References
- advisoryVulnCheck exploitation report
- advisoryhttps://fortiguard.fortinet.com/psirt/FG-IR-25-647
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2025-59718
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2025-59719
- advisoryUSOM advisory
FAQ
Common Questions.
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…
Affected: Fortiproxy (Fortinet) versions 7.0.0, 7.0.1, 7.0.10, 7.0.11, 7.0.12, 7.0.13, 7.0.14, 7.0.15; Fortiswitchmanager (Fortinet) versions 7.0.0, 7.0.1, 7.0.2, 7.0.3, 7.0.4, 7.0.5, 7.2.0, 7.2.1; Fortios (Fortinet) versions 7.0.0, 7.0.1, 7.0.10, 7.0.11, 7.0.12, 7.0.13, 7.0.14, 7.0.15, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Dec 15, 2025 and is known to be used in ransomware campaigns.
Yes. It was added on Dec 16, 2025 with a federal remediation due date of Dec 23, 2025.
Public exploit code is available.
Fixed versions are available, including Fortios 7.0.18, Fortiproxy 7.0.22, Fortiswitchmanager 7.0.6.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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