CVE-2025-59718
Fortinet · published 2025-12-09
Source record Collected from the National Vulnerability Database (NVD)
CISA Known Exploited Vulnerabilities
CISA lists this CVE as known exploited (added 2025-12-16).
- CISA's name for it: Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
- CISA's description: Fortinet FortiOS, FortiSwitchMaster, FortiProxy, and FortiWeb contain an improper verification of cryptographic signature vulnerability that may allow an unauthenticated attacker to bypass the FortiCloud SSO login authentication via a crafted SAML message. Please be aware that CVE-2025-59719 pertains to the same problem and is mentioned in the same vendor advisory. Ensure to apply all patches mentioned in the advisory.
- Known ransomware campaign use, per CISA: Unknown
Source: CISA KEV catalog (CC0 1.0).
Description
Description by Fortinet, Inc. via the CVE Program.
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.
Status at the source
- NVD status: Analyzed
Affected products, as the source lists them
| Vendor | Product | Versions |
|---|---|---|
| Fortinet | FortiSwitchManager | 7.2.0 – 7.2.6 and earlier: affected 7.0.0 – 7.0.5 and earlier: affected |
| Fortinet | FortiOS | 7.6.0 – 7.6.3 and earlier: affected 7.4.0 – 7.4.8 and earlier: affected 7.2.0 – 7.2.11 and earlier: affected 7.0.0 – 7.0.17 and earlier: affected |
| Fortinet | FortiProxy | 7.6.0 – 7.6.3 and earlier: affected 7.4.0 – 7.4.10 and earlier: affected 7.2.0 – 7.2.14 and earlier: affected 7.0.0 – 7.0.21 and earlier: affected |
Added by siemens-SADP (Authorized Data Publisher)
| Vendor | Product | Versions |
|---|---|---|
| Siemens | RUGGEDCOM APE1808 | 0 – before *: affected |
Products named in NVD's CPE match criteria (4)
cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*cpe:2.3:a:fortinet:fortiswitchmanager:*:*:*:*:*:*:*:*cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*cpe:2.3:o:siemens:ruggedcom_ape1808_firmware:-:*:*:*:*:*:*:*
DeSpy has not checked any unit, hardware revision or firmware. A product missing here is not a statement that it is unaffected.
Scores, as their sources published them
- CVSS 3.1: 9.8 CRITICAL — as published by Fortinet, Inc. (Secondary)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - SSVC — CISA's assessment (SSVC 2.0.3, CISA Coordinator): Exploitation: active · Automatable: yes · Technical impact: total
DeSpy does not score records. These are the sources' own values.
Weaknesses
Sources
References the source lists
- https://fortiguard.fortinet.com/psirt/FG-IR-25-647
- https://arcticwolf.com/resources/blog/arctic-wolf-observes-malicious-sso-logins-following-disclosure-cve-2025-59718-cve-2025-59719/
- https://cert-portal.siemens.com/productcert/html/ssa-864900.html
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59718
Source dates: published 2025-12-09, last changed 2026-06-17. DeSpy's copy of this version is dated 2026-09-28.
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