Technology · Fortinet
Fortinet FortiOS vulnerabilities
Updated . Rebuilt every hour.
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.
- Last 7 days
- 8
- Last 90 days
- 11
- Critical, all time
- 25
- Exploited in the wild
- 21
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 executioncriticalCVSS 9.8
- CVE-2026-126258: Fortinet FortiOS stack buffer overflow in WAD proxyhighCVSS 7.5
- CVE-2026-126256: Fortinet FortiOS out-of-bounds read in kernelhighCVSS 7.4
- CVE-2026-126255: Fortinet FortiOS path traversal authentication bypass in SSH daemonhighCVSS 7.4
- CVE-2026-126254: Fortinet FortiOS numeric truncation error in BGP daemoncriticalCVSS 9.6
- CVE-2026-126253: Fortinet FortiOS authentication bypass in OSPF daemoncriticalCVSS 9.3
- CVE-2026-121528: Fortinet FortiOS improper certificate validation in SSLVPNhighCVSS 8.1
- CVE-2026-121530: Fortinet FortiOS improper authentication in RADIUS TFAmediumCVSS 6.6
- CVE-2026-106174: Fortinet FortiOS improper locking in HTTPS management interfacehighCVSS 7.5
- CVE-2026-84393: Fortinet FortiOS and FortiProxy certificate validation bypass in ZTNA portalhighCVSS 8.1EPSS 0.3%
- CVE-2026-84392: Fortinet FortiOS, FortiProxy, FortiPAM NULL pointer dereference in httpsdlowCVSS 2.7EPSS 0.5%
- CVE-2026-71408: A allocation of resources without limits or throttling vulnerability in Fortinet FortiOS 7.6.0 through 7.6.6, FortiOS…mediumCVSS 5.3EPSS 0.4%
- CVE-2026-71407: A Stack-based Buffer Overflow vulnerability [CWE-121] vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6 may allow…mediumCVSS 5.6EPSS 0.5%
- CVE-2026-59840: Fortinet FortiOS and FortiProxy buffer over-read in authd and wad daemonsmediumCVSS 4.3
- CVE-2026-59839: Fortinet FortiOS and FortiProxy path traversal in CLImediumCVSS 5.5
- CVE-2026-59837: Fortinet FortiOS and FortiPAM stack overflow in GUImediumCVSS 6.6
- CVE-2026-23573: Fortinet FortiOS and FortiProxy reflected XSS in Agentless SSL-VPNmediumCVSS 6.1
- CVE-2025-62826: Fortinet FortiOS and FortiProxy HTTP Response Splitting in captive portallowCVSS 3.1
- CVE-2025-62675: Fortinet FortiOS and FortiProxy HTTP response splitting in Web FilterlowCVSS 3.4
- CVE-2025-43892: Fortinet FortiOS buffer over-read in redirect responsemediumCVSS 4.3
- CVE-2025-67862: Fortinet FortiOS and FortiProxy Lua script execution in CLImediumCVSS 6.7
- CVE-2025-53844: Fortinet FortiOS out-of-bounds write via crafted packetshighCVSS 8.8EPSS 0.0%
- CVE-2025-61624: Fortinet multiple products path traversal in CLIcriticalexploited in the wildCVSS 6EPSS 0.6%
- CVE-2025-53847: Fortinet FortiOS missing authentication in CAPWAP daemonmediumCVSS 6.5
- CVE-2025-68686: Fortinet FortiOS information disclosure in SSL-VPNcriticalexploited in the wildCVSS 5.9EPSS 0.5%
Most severe Fortinet FortiOS vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2025-59718: Fortinet Multiple Products auth bypass via improper SAML signature verificationcriticalexploited in the wildCVSS 9.8EPSS 9.5%
- CVE-2026-24858: Fortinet Multiple Products authentication bypass in FortiCloud SSOcriticalexploited in the wildCVSS 9.8EPSS 4.8%
- CVE-2024-55591: Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2024-23113: Fortinet Multiple Products Format String Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2024-21762: Fortinet FortiOS Out-of-Bound Write Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2023-27997: Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2022-42475: Fortinet FortiOS Heap-Based Buffer Overflow Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2022-40684: Fortinet Multiple Products Authentication Bypass Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2018-13379: Fortinet FortiOS SSL VPN Path Traversal Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2020-12812: Fortinet FortiOS SSL VPN Improper Authentication Vulnerabilitycriticalexploited in the wildCVSS 9.8
Vulnerabilities per week
1 vulnerability in the last four weeks, up from none in the four before. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 2 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 1 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 8 | 3 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many Fortinet FortiOS vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/technologies/fortios)<a href="https://junglewise.ai/threats/technologies/fortios"><img src="https://junglewise.ai/threats/technologies/fortios/badge.svg" alt="Fortinet FortiOS vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/fortios.json, and this page as text at https://junglewise.ai/threats/technologies/fortios.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Fortinet FortiOS vulnerabilities", https://junglewise.ai/threats/technologies/fortios, 12 November 2026.