# Fortinet FortiOS vulnerabilities Source: https://junglewise.ai/threats/technologies/fortios Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats Updated: 12 November 2026, 03:07 UTC. Rebuilt every hour. Data: https://junglewise.ai/threats/technologies/fortios.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 66 vulnerabilities in Fortinet FortiOS: 8 in the last 7 days and 11 in the last 90 days, 25 of them critical and 21 exploited in the wild. The most recent, CVE-2026-126259, was published on 11 November 2026. 1 vulnerability in the last four weeks, up from none in the four before. ## Counts - Last 7 days: 8 - Last 30 days: 9 - Last 90 days: 11 - All time: 66 (25 critical, 21 exploited in the wild) ## About Fortinet FortiOS Operating system firmware for Fortinet FortiGate security appliances. ## Latest Fortinet FortiOS vulnerabilities - [CVE-2026-126259: Fortinet FortiOS authentication bypass in HA command execution](https://junglewise.ai/threats/cve-2026-126259-a-missing-authentication-for-critical-function-vulnerability-in) (critical, CVSS 9.8, published 11 Nov 2026) - [CVE-2026-126258: Fortinet FortiOS stack buffer overflow in WAD proxy](https://junglewise.ai/threats/cve-2026-126258-a-stack-based-buffer-overflow-vulnerability-in-fortinet-fortios) (high, CVSS 7.5, published 11 Nov 2026) - [CVE-2026-126256: Fortinet FortiOS out-of-bounds read in kernel](https://junglewise.ai/threats/cve-2026-126256-a-out-of-bounds-read-vulnerability-in-fortinet-fortios-8-0-0) (high, CVSS 7.4, published 11 Nov 2026) - [CVE-2026-126255: Fortinet FortiOS path traversal authentication bypass in SSH daemon](https://junglewise.ai/threats/cve-2026-126255-a-path-traversal-filedir-vulnerability-in-fortinet-fortios-8-0-0) (high, CVSS 7.4, published 11 Nov 2026) - [CVE-2026-126254: Fortinet FortiOS numeric truncation error in BGP daemon](https://junglewise.ai/threats/cve-2026-126254-a-numeric-truncation-error-vulnerability-in-fortinet-fortios-8-0) (critical, CVSS 9.6, published 11 Nov 2026) - [CVE-2026-126253: Fortinet FortiOS authentication bypass in OSPF daemon](https://junglewise.ai/threats/cve-2026-126253-a-authentication-bypass-by-primary-weakness-vulnerability-in) (critical, CVSS 9.3, published 11 Nov 2026) - [CVE-2026-121528: Fortinet FortiOS improper certificate validation in SSLVPN](https://junglewise.ai/threats/cve-2026-121528-a-improper-certificate-validation-vulnerability-in-fortinet) (high, CVSS 8.1, published 11 Nov 2026) - [CVE-2026-121530: Fortinet FortiOS improper authentication in RADIUS TFA](https://junglewise.ai/threats/cve-2026-121530-a-improper-authentication-vulnerability-in-fortinet-fortios-7-6) (medium, CVSS 6.6, published 10 Nov 2026) - [CVE-2026-106174: Fortinet FortiOS improper locking in HTTPS management interface](https://junglewise.ai/threats/cve-2026-106174-a-improper-locking-vulnerability-in-fortinet-fortios-8-0-0) (high, CVSS 7.5, published 27 Oct 2026) - [CVE-2026-84393: Fortinet FortiOS and FortiProxy certificate validation bypass in ZTNA portal](https://junglewise.ai/threats/cve-2026-84393-fortinet-fortios-and-fortiproxy-certificate-validation-bypass-in) (high, CVSS 8.1, published 8 Sep 2026) - [CVE-2026-84392: Fortinet FortiOS, FortiProxy, FortiPAM NULL pointer dereference in httpsd](https://junglewise.ai/threats/cve-2026-84392-fortinet-fortios-fortiproxy-fortipam-null-pointer-dereference-in) (low, CVSS 2.7, published 8 Sep 2026) - [CVE-2026-71408: A allocation of resources without limits or throttling vulnerability in Fortinet FortiOS 7.6.0 through 7.6.6, FortiOS…](https://junglewise.ai/threats/cve-2026-71408-a-allocation-of-resources-without-limits-or-throttling) (medium, CVSS 5.3, published 12 Aug 2026) - [CVE-2026-71407: A Stack-based Buffer Overflow vulnerability CWE-121 vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6 may allow…](https://junglewise.ai/threats/cve-2026-71407-a-stack-based-buffer-overflow-vulnerability-cwe-121-vulnerability) (medium, CVSS 5.6, published 12 Aug 2026) - [CVE-2026-59840: Fortinet FortiOS and FortiProxy buffer over-read in authd and wad daemons](https://junglewise.ai/threats/cve-2026-59840-fortinet-fortios-and-fortiproxy-buffer-over-read-in-authd-and-wad) (medium, CVSS 4.3, published 14 Jul 2026) - [CVE-2026-59839: Fortinet FortiOS and FortiProxy path traversal in CLI](https://junglewise.ai/threats/cve-2026-59839-fortinet-fortios-and-fortiproxy-path-traversal-in-cli) (medium, CVSS 5.5, published 14 Jul 2026) - [CVE-2026-59837: Fortinet FortiOS and FortiPAM stack overflow in GUI](https://junglewise.ai/threats/cve-2026-59837-fortinet-fortios-and-fortipam-stack-overflow-in-gui) (medium, CVSS 6.6, published 14 Jul 2026) - [CVE-2026-23573: Fortinet FortiOS and FortiProxy reflected XSS in Agentless SSL-VPN](https://junglewise.ai/threats/cve-2026-23573-fortinet-fortios-and-fortiproxy-reflected-xss-in-agentless-ssl) (medium, CVSS 6.1, published 14 Jul 2026) - [CVE-2025-62826: Fortinet FortiOS and FortiProxy HTTP Response Splitting in captive portal](https://junglewise.ai/threats/cve-2025-62826-fortinet-fortios-and-fortiproxy-http-response-splitting-in) (low, CVSS 3.1, published 14 Jul 2026) - [CVE-2025-62675: Fortinet FortiOS and FortiProxy HTTP response splitting in Web Filter](https://junglewise.ai/threats/cve-2025-62675-fortinet-fortios-and-fortiproxy-http-response-splitting-in-web) (low, CVSS 3.4, published 14 Jul 2026) - [CVE-2025-43892: Fortinet FortiOS buffer over-read in redirect response](https://junglewise.ai/threats/cve-2025-43892-fortinet-fortios-buffer-over-read-in-redirect-response) (medium, CVSS 4.3, published 14 Jul 2026) - [CVE-2025-67862: Fortinet FortiOS and FortiProxy Lua script execution in CLI](https://junglewise.ai/threats/cve-2025-67862-fortinet-fortios-and-fortiproxy-lua-script-execution-in-cli) (medium, CVSS 6.7, published 9 Jun 2026) - [CVE-2025-53844: Fortinet FortiOS out-of-bounds write via crafted packets](https://junglewise.ai/threats/cve-2025-53844-fortinet-fortios-out-of-bounds-write-via-crafted-packets) (high, CVSS 8.8, published 12 May 2026) - [CVE-2025-61624: Fortinet multiple products path traversal in CLI](https://junglewise.ai/threats/cve-2025-61624-fortinet-multiple-products-path-traversal-in-cli) (critical, exploited in the wild, CVSS 6, published 14 Apr 2026) - [CVE-2025-53847: Fortinet FortiOS missing authentication in CAPWAP daemon](https://junglewise.ai/threats/cve-2025-53847-fortinet-fortios-missing-authentication-in-capwap-daemon) (medium, CVSS 6.5, published 14 Apr 2026) - [CVE-2025-68686: Fortinet FortiOS information disclosure in SSL-VPN](https://junglewise.ai/threats/cve-2025-68686-fortinet-fortios-information-disclosure-in-ssl-vpn) (critical, exploited in the wild, CVSS 5.9, published 10 Feb 2026) ## Most severe Fortinet FortiOS vulnerabilities - [CVE-2025-59718: Fortinet Multiple Products auth bypass via improper SAML signature verification](https://junglewise.ai/threats/cve-2025-59718-fortinet-multiple-products-auth-bypass-via-improper-saml) (critical, exploited in the wild, CVSS 9.8, published 9 Dec 2025) - [CVE-2026-24858: Fortinet Multiple Products authentication bypass in FortiCloud SSO](https://junglewise.ai/threats/cve-2026-24858-fortinet-multiple-products-authentication-bypass-in-forticloud) (critical, exploited in the wild, CVSS 9.8, published 27 Jan 2026) - [CVE-2024-55591: Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability](https://junglewise.ai/threats/cve-2024-55591-fortinet-fortios-and-fortiproxy-authentication-bypass) (critical, exploited in the wild, CVSS 9.8, published 14 Jan 2025) - [CVE-2024-23113: Fortinet Multiple Products Format String Vulnerability](https://junglewise.ai/threats/cve-2024-23113-fortinet-multiple-products-format-string-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 9 Oct 2024) - [CVE-2024-21762: Fortinet FortiOS Out-of-Bound Write Vulnerability](https://junglewise.ai/threats/cve-2024-21762-fortinet-fortios-out-of-bound-write-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 9 Feb 2024) - [CVE-2023-27997: Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability](https://junglewise.ai/threats/cve-2023-27997-fortinet-fortios-and-fortiproxy-ssl-vpn-heap-based-buffer) (critical, exploited in the wild, CVSS 9.8, published 13 Jun 2023) - [CVE-2022-42475: Fortinet FortiOS Heap-Based Buffer Overflow Vulnerability](https://junglewise.ai/threats/cve-2022-42475-fortinet-fortios-heap-based-buffer-overflow-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 13 Dec 2022) - [CVE-2022-40684: Fortinet Multiple Products Authentication Bypass Vulnerability](https://junglewise.ai/threats/cve-2022-40684-fortinet-multiple-products-authentication-bypass-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 11 Oct 2022) - [CVE-2018-13379: Fortinet FortiOS SSL VPN Path Traversal Vulnerability](https://junglewise.ai/threats/cve-2018-13379-fortinet-fortios-ssl-vpn-path-traversal-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 3 Nov 2021) - [CVE-2020-12812: Fortinet FortiOS SSL VPN Improper Authentication Vulnerability](https://junglewise.ai/threats/cve-2020-12812-fortinet-fortios-ssl-vpn-improper-authentication-vulnerability) (critical, exploited in the wild, CVSS 9.8, published 3 Nov 2021) ## Vulnerabilities per week 1 vulnerability in the last four weeks, up from none in the four before. | Week of | Vulns | Critical | Exploited | | --- | --- | --- | --- | | 17 Aug 2026 | 0 | 0 | 0 | | 24 Aug 2026 | 0 | 0 | 0 | | 31 Aug 2026 | 0 | 0 | 0 | | 7 Sep 2026 | 2 | 0 | 0 | | 14 Sep 2026 | 0 | 0 | 0 | | 21 Sep 2026 | 0 | 0 | 0 | | 28 Sep 2026 | 0 | 0 | 0 | | 5 Oct 2026 | 0 | 0 | 0 | | 12 Oct 2026 | 0 | 0 | 0 | | 19 Oct 2026 | 0 | 0 | 0 | | 26 Oct 2026 | 1 | 0 | 0 | | 2 Nov 2026 | 0 | 0 | 0 | | 9 Nov 2026 | 8 | 3 | 0 | ## Other Fortinet technologies - [Fortinet FortiManager](https://junglewise.ai/threats/technologies/fortimanager): 54 vulnerabilities - [Fortinet FortiManager Cloud](https://junglewise.ai/threats/technologies/fortimanager-cloud): 48 vulnerabilities - [Fortinet FortiAnalyzer](https://junglewise.ai/threats/technologies/fortianalyzer): 47 vulnerabilities - [Fortinet Fortianalyzer Cloud](https://junglewise.ai/threats/technologies/fortianalyzer-cloud): 42 vulnerabilities - [Fortinet FortiProxy](https://junglewise.ai/threats/technologies/fortiproxy): 35 vulnerabilities - [Fortinet FortiMail](https://junglewise.ai/threats/technologies/fortimail): 31 vulnerabilities - [Fortinet FortiAuthenticator](https://junglewise.ai/threats/technologies/fortiauthenticator): 22 vulnerabilities - [Fortinet FortiSandbox](https://junglewise.ai/threats/technologies/fortisandbox): 17 vulnerabilities - [Fortinet FortiWeb](https://junglewise.ai/threats/technologies/fortiweb): 16 vulnerabilities - [Fortinet Fortisase](https://junglewise.ai/threats/technologies/fortisase): 13 vulnerabilities - [Fortinet FortiPAM](https://junglewise.ai/threats/technologies/fortipam): 12 vulnerabilities - [Fortinet FortiSandbox Cloud](https://junglewise.ai/threats/technologies/fortisandbox-cloud): 12 vulnerabilities ## Sources NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Fortinet FortiOS vulnerabilities", https://junglewise.ai/threats/technologies/fortios, 12 November 2026.