{"id":"CVE-2025-59718","aliases":["EUVD-2025-202198","GHSA-fjj2-p33c-f8qq"],"status":"published","title":"A improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0...","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.","severity":{"version":"3.1","score":9.1,"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","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.68087,"percentile":0.99337,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":false},"cwes":["CWE-347"],"published":"2025-12-09T17:20:11Z","modified":"2026-10-15T01:09:26Z","kev":{"date_added":"2025-12-16","due_date":"2025-12-23","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.","known_ransomware_use":"Unknown"},"exploitation":[{"source":"euvd","since":"2025-12-16"},{"source":"kev","since":"2025-12-16"}],"exploits":[{"source":"pocgithub","id":"exfil0/CVE-2025-59718-PoC","title":"exfil0/CVE-2025-59718-PoC","date":"2025-12-17","url":"https://github.com/exfil0/CVE-2025-59718-PoC"},{"source":"pocgithub","id":"moften/CVE-2025-59718-Fortinet-Poc","title":"moften/CVE-2025-59718-Fortinet-Poc","date":"2025-12-27","url":"https://github.com/moften/CVE-2025-59718-Fortinet-Poc"}],"products":[{"vendor":"fortinet","product":"fortios"},{"vendor":"fortinet","product":"fortiproxy"},{"vendor":"fortinet","product":"fortiswitchmanager"},{"vendor":"fortinet","product":"multiple products"},{"vendor":"siemens","product":"ruggedcom ape1808"},{"vendor":"siemens","product":"ruggedcom_ape1808_firmware"}],"references":[{"url":"https://fortiguard.fortinet.com/psirt/FG-IR-25-647","tags":["Vendor Advisory"]},{"url":"https://arcticwolf.com/resources/blog/arctic-wolf-observes-malicious-sso-logins-following-disclosure-cve-2025-59718-cve-2025-59719/","tags":["third-party-advisory","Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-59718","tags":["government-resource","US Government Resource"]},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-864900.html","tags":["Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-59718"},{"url":"https://arcticwolf.com/resources/blog/arctic-wolf-observes-malicious-sso-logins-following-disclosure-cve-2025-59718-cve-2025-59719"},{"url":"https://github.com/advisories/GHSA-fjj2-p33c-f8qq"}],"sources":{"cve":[{"id":"CVE-2025-59718","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.","status":"published","published":"2025-12-09T17:20:11.783Z","modified":"2026-10-15T01:09:26.767Z","cvss":[{"version":"3.1","score":9.1,"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","level":"critical","assessor":"cna"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T14:32:47.812946Z"}],"euvd":[{"id":"EUVD-2025-202198","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.","status":"published","published":"2025-12-09T17:20:11Z","modified":"2026-10-15T01:09:26Z","cvss":[{"version":"3.1","score":9.1,"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","level":"critical"}],"exploited_since":"2025-12-16","updated_at":"2026-11-02T17:27:06.951216Z"}],"ghsa":[{"id":"GHSA-fjj2-p33c-f8qq","title":"A improper verification of cryptographic signature vulnerability in Fortinet FortiOS 7.6.0...","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.","status":"published","published":"2025-12-09T18:30:46Z","modified":"2026-06-09T12:32:00Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T15:08:40.238392Z"}],"kev":[{"id":"CVE-2025-59718","title":"Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability","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.","cwes":["CWE-347"],"kev":{"date_added":"2025-12-16","due_date":"2025-12-23","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.","known_ransomware_use":"Unknown"},"updated_at":"2026-11-02T17:00:15.999436Z"}],"nvd":[{"id":"CVE-2025-59718","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.","status":"published","published":"2025-12-09T18:15:54.983Z","modified":"2026-06-17T09:46:35.807Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T14:11:49.468427Z"}]}}