Technology · Fortinet
Fortinet FortiOS vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 54 vulnerabilities in Fortinet FortiOS: 0 in the last 7 days and 9 in the last 90 days, 21 of them critical and 20 exploited in the wild. The most recent, CVE-2026-84393, was published on 8 September 2026.
- Last 7 days
- 0
- Last 90 days
- 9
- Critical, all time
- 21
- Exploited in the wild
- 20
Latest Fortinet FortiOS vulnerabilities
- 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-2026-59840: 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 CLImediumCVSS 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%
- CVE-2025-64157: Fortinet FortiOS format string vulnerability in CAPWAP fast-failover modemediumCVSS 6.7
- CVE-2025-62439: Fortinet FortiOS firewall policy bypass in FSSO Terminal Services AgentmediumCVSS 4.2
- CVE-2025-55018: Fortinet FortiOS HTTP request smuggling in firewall policiesmediumCVSS 5.8
- CVE-2026-24858: Fortinet Multiple Products authentication bypass in FortiCloud SSOcriticalexploited in the wildCVSS 9.8EPSS 4.8%
- CVE-2025-25249: Fortinet FortiOS heap overflow in cw_acd daemoncriticalexploited in the wildCVSS 8.1EPSS 3.9%
- CVE-2025-59719: Fortinet Multiple Products FortiCloud SSO auth bypass via SAML signature flawcriticalCVSS 9.8EPSS 0.3%
- CVE-2025-59718: Fortinet Multiple Products auth bypass via improper SAML signature verificationcriticalexploited in the wildCVSS 9.8EPSS 9.5%
- CVE-2025-58413: Fortinet FortiOS stack buffer overflow in CAPWAP daemonhighCVSS 7.5EPSS 0.0%
- CVE-2025-54821: Fortinet FortiOS Improper Privilege Management in CLIlowCVSS 1.9EPSS 0.0%
- CVE-2025-53843: Fortinet FortiOS stack buffer overflow in CAPWAP daemonhighCVSS 7.5EPSS 0.0%
- CVE-2025-58903: Fortinet FortiOS null pointer dereference in APIlowCVSS 2.7EPSS 0.1%
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-2020-12812: Fortinet FortiOS SSL VPN Improper Authentication Vulnerabilitycriticalexploited in the wildCVSS 9.8
- CVE-2018-13379: Fortinet FortiOS SSL VPN Path Traversal Vulnerabilitycriticalexploited in the wildCVSS 9.8
Vulnerabilities per week
The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 29 Jun 2026 | 0 | 0 | |
| 6 Jul 2026 | 0 | 0 | |
| 13 Jul 2026 | 7 | 0 | |
| 20 Jul 2026 | 0 | 0 | |
| 27 Jul 2026 | 0 | 0 | |
| 3 Aug 2026 | 0 | 0 | |
| 10 Aug 2026 | 0 | 0 | |
| 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 |
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, 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, 26 September 2026.