# FortiOS vulnerabilities

> FortiOS is made by Fortinet. We track 240 published vulnerabilities listed under that exact name, across 278 versions. 18 of them are on the list of flaws known to be exploited, the newest added on 9 September 2026. Fortinet lists newer releases under their own names, such as FortiOS IPS Engine, so check those pages too.

Canonical page: https://www.precursorintelligence.com/product/fortinet/fortios

## At a glance

- **Made by:** [Fortinet](https://www.precursorintelligence.com/vendors/fortinet)
- **Published vulnerabilities:** 240
- **Known to be exploited:** 18 (listed under the name FortiOS)
- **Versions tracked:** 278
- **Most recently added to the known-exploited list:** [CVE-2025-25249](https://www.precursorintelligence.com/what-is/cve-2025-25249), 9 September 2026. We keep watching the list.

## Is FortiOS listed under other names?

Fortinet also lists FortiOS under more specific names, such as FortiOS IPS Engine. Flaws listed only under those names are counted on their own pages, not here.

- [FortiOS IPS Engine](https://www.precursorintelligence.com/product/fortinet/fortios_ips_engine): 2 published vulnerabilities

## Which versions of FortiOS do the exploited flaws hit?

Each exploited flaw lists the versions it affects, as published. "6.4.0 to before 7.0.18" means from 6.4.0 up to, but not including, 7.0.18.

- [CVE-2025-25249](https://www.precursorintelligence.com/what-is/cve-2025-25249) (Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability): 6.4.0 to before 7.0.18, 7.2.0 to before 7.2.12, 7.4.0 to before 7.4.9, 7.6.0 to before 7.6.4
- [CVE-2025-59718](https://www.precursorintelligence.com/what-is/cve-2025-59718) (Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability): 7.0.0 to 7.0.17, 7.2.0 to 7.2.11, 7.4.0 to 7.4.8, 7.6.0 to 7.6.3
- [CVE-2019-6693](https://www.precursorintelligence.com/what-is/cve-2019-6693) (Fortinet FortiOS Use of Hard-Coded Credentials Vulnerability): up to 5.6.10, 6.0.0 to 6.0.6, 6.2.0
- [CVE-2025-24472](https://www.precursorintelligence.com/what-is/cve-2025-24472) (Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability): 7.0.0 to before 7.0.17
- [CVE-2024-55591](https://www.precursorintelligence.com/what-is/cve-2024-55591) (Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability): 7.0.0 to before 7.0.17
- [CVE-2024-23113](https://www.precursorintelligence.com/what-is/cve-2024-23113) (Fortinet Multiple Products Format String Vulnerability): 7.0.0 to 7.0.13, 7.2.0 to 7.2.6, 7.4.0 to 7.4.2
- [CVE-2024-21762](https://www.precursorintelligence.com/what-is/cve-2024-21762) (Fortinet FortiOS Out-of-Bound Write Vulnerability): 6.0.0 to before 6.0.18, 6.2.0 to before 6.2.16, 6.4.0 to before 6.4.15, 7.0.0 to before 7.0.14, 7.2.0 to before 7.2.7, 7.4.0 to before 7.4.3
- [CVE-2023-27997](https://www.precursorintelligence.com/what-is/cve-2023-27997) (Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability): 6.0.0 to 6.0.16, 6.2.0 to 6.2.13, 6.4.0 to 6.4.12, 7.0.0 to 7.0.11, 7.2.0 to 7.2.4
- [CVE-2022-41328](https://www.precursorintelligence.com/what-is/cve-2022-41328) (Fortinet FortiOS Path Traversal Vulnerability): 6.0.0 to 6.0.16, 6.2.0 to before 6.2.14, 6.4.0 to before 6.4.12, 7.0.0 to before 7.0.10, 7.2.0 to before 7.2.4
- [CVE-2022-42475](https://www.precursorintelligence.com/what-is/cve-2022-42475) (Fortinet FortiOS Heap-Based Buffer Overflow Vulnerability): 5.0.0 to 5.0.14, 5.2.0 to 5.2.15, 5.4.0 to 5.4.13, 5.6.0 to 5.6.14, 6.0.0 to before 6.0.16, 6.2.0 to before 6.2.12, 6.4.0 to before 6.4.11, 7.0.0 to before 7.0.9, 7.2.0 to before 7.2.3
- [CVE-2022-40684](https://www.precursorintelligence.com/what-is/cve-2022-40684) (Fortinet Multiple Products Authentication Bypass Vulnerability): 7.0.0 to before 7.0.7, 7.2.0 to before 7.2.2
- [CVE-2018-13374](https://www.precursorintelligence.com/what-is/cve-2018-13374) (Fortinet FortiOS and FortiADC Improper Access Control Vulnerability): before 6.0.3
- [CVE-2018-13383](https://www.precursorintelligence.com/what-is/cve-2018-13383) (Fortinet FortiOS and FortiProxy Out-of-bounds Write): 5.2.0 to before 5.2.15, 5.4.0 to before 5.4.13, 5.6.0 to before 5.6.11, 6.0.0 to before 6.0.5
- [CVE-2018-13382](https://www.precursorintelligence.com/what-is/cve-2018-13382) (Fortinet FortiOS and FortiProxy Improper Authorization): 5.4.1 to before 5.4.11, 5.6.0 to before 5.6.9, 6.0.0 to before 6.0.5
- [CVE-2021-44168](https://www.precursorintelligence.com/what-is/cve-2021-44168) (Fortinet FortiOS Arbitrary File Download): before 6.0.14, 6.2.0 to before 6.2.10, 6.4.0 to before 6.4.8, 7.0.0 to before 7.0.3
- [CVE-2018-13379](https://www.precursorintelligence.com/what-is/cve-2018-13379) (Fortinet FortiOS SSL VPN Path Traversal Vulnerability): 5.4.6 to before 5.4.13, 5.6.3 to before 5.6.8, 6.0.0 to before 6.0.5
- [CVE-2020-12812](https://www.precursorintelligence.com/what-is/cve-2020-12812) (Fortinet FortiOS SSL VPN Improper Authentication Vulnerability): before 6.0.10, 6.2.0 to before 6.2.4, 6.4.0
- [CVE-2019-5591](https://www.precursorintelligence.com/what-is/cve-2019-5591) (Fortinet FortiOS Default Configuration Vulnerability): up to 6.2.0

## Which FortiOS vulnerabilities are being exploited?

18 flaws are on the government list of vulnerabilities known to be exploited, newest first:

- [CVE-2025-25249](https://www.precursorintelligence.com/what-is/cve-2025-25249): Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability. High, CVSS 8.1, chance of use in 30 days 3.8%, known exploited since 9 September 2026.
- [CVE-2025-59718](https://www.precursorintelligence.com/what-is/cve-2025-59718): Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability. Critical, CVSS 9.8, chance of use in 30 days 68%, known exploited since 16 December 2025.
- [CVE-2019-6693](https://www.precursorintelligence.com/what-is/cve-2019-6693): Fortinet FortiOS Use of Hard-Coded Credentials Vulnerability. Medium, CVSS 6.5, chance of use in 30 days 6.6%, known exploited since 25 June 2025.
- [CVE-2025-24472](https://www.precursorintelligence.com/what-is/cve-2025-24472): Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability. High, CVSS 8.1, chance of use in 30 days 7.2%, known exploited since 18 March 2025.
- [CVE-2024-55591](https://www.precursorintelligence.com/what-is/cve-2024-55591): Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability. Critical, CVSS 9.8, chance of use in 30 days 94%, known exploited since 14 January 2025.
- [CVE-2024-23113](https://www.precursorintelligence.com/what-is/cve-2024-23113): Fortinet Multiple Products Format String Vulnerability. Critical, CVSS 9.8, chance of use in 30 days 62%, known exploited since 9 October 2024.
- [CVE-2024-21762](https://www.precursorintelligence.com/what-is/cve-2024-21762): Fortinet FortiOS Out-of-Bound Write Vulnerability. Critical, CVSS 9.8, chance of use in 30 days 83%, known exploited since 9 February 2024.
- [CVE-2023-27997](https://www.precursorintelligence.com/what-is/cve-2023-27997): Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability. Critical, CVSS 9.8, chance of use in 30 days 86%, known exploited since 13 June 2023.
- [CVE-2022-41328](https://www.precursorintelligence.com/what-is/cve-2022-41328): Fortinet FortiOS Path Traversal Vulnerability. Medium, CVSS 6.7, chance of use in 30 days 11%, known exploited since 14 March 2023.
- [CVE-2022-42475](https://www.precursorintelligence.com/what-is/cve-2022-42475): Fortinet FortiOS Heap-Based Buffer Overflow Vulnerability. Critical, CVSS 9.8, chance of use in 30 days >99%, known exploited since 13 December 2022.
- [CVE-2022-40684](https://www.precursorintelligence.com/what-is/cve-2022-40684): Fortinet Multiple Products Authentication Bypass Vulnerability. Critical, CVSS 9.8, chance of use in 30 days >99%, known exploited since 11 October 2022.
- [CVE-2018-13374](https://www.precursorintelligence.com/what-is/cve-2018-13374): Fortinet FortiOS and FortiADC Improper Access Control Vulnerability. Medium, CVSS 4.3, chance of use in 30 days 38%, known exploited since 8 September 2022.
- [CVE-2018-13383](https://www.precursorintelligence.com/what-is/cve-2018-13383): Fortinet FortiOS and FortiProxy Out-of-bounds Write. Medium, CVSS 4.3, chance of use in 30 days 34%, known exploited since 10 January 2022.
- [CVE-2018-13382](https://www.precursorintelligence.com/what-is/cve-2018-13382): Fortinet FortiOS and FortiProxy Improper Authorization. Critical, CVSS 9.1, chance of use in 30 days 82%, known exploited since 10 January 2022.
- [CVE-2021-44168](https://www.precursorintelligence.com/what-is/cve-2021-44168): Fortinet FortiOS Arbitrary File Download. Low, CVSS 3.3, chance of use in 30 days 0.9%, known exploited since 10 December 2021.
- [CVE-2018-13379](https://www.precursorintelligence.com/what-is/cve-2018-13379): Fortinet FortiOS SSL VPN Path Traversal Vulnerability. Critical, CVSS 9.1, chance of use in 30 days >99%, known exploited since 3 November 2021.
- [CVE-2020-12812](https://www.precursorintelligence.com/what-is/cve-2020-12812): Fortinet FortiOS SSL VPN Improper Authentication Vulnerability. Critical, CVSS 9.8, chance of use in 30 days 45%, known exploited since 3 November 2021.
- [CVE-2019-5591](https://www.precursorintelligence.com/what-is/cve-2019-5591): Fortinet FortiOS Default Configuration Vulnerability. Medium, CVSS 6.5, chance of use in 30 days 19%, known exploited since 3 November 2021.

## Which FortiOS flaws are most likely to be used?

Ranked by the latest exploit-likelihood forecast (the chance each flaw is used in an attack in the next 30 days):

- [CVE-2018-13379](https://www.precursorintelligence.com/what-is/cve-2018-13379): >99%, Critical (CVSS 9.1), known exploited
- [CVE-2022-40684](https://www.precursorintelligence.com/what-is/cve-2022-40684): >99%, Critical (CVSS 9.8), known exploited
- [CVE-2022-42475](https://www.precursorintelligence.com/what-is/cve-2022-42475): >99%, Critical (CVSS 9.8), known exploited
- [CVE-2024-55591](https://www.precursorintelligence.com/what-is/cve-2024-55591): 94%, Critical (CVSS 9.8), known exploited
- [CVE-2023-27997](https://www.precursorintelligence.com/what-is/cve-2023-27997): 86%, Critical (CVSS 9.8), known exploited
- [CVE-2024-21762](https://www.precursorintelligence.com/what-is/cve-2024-21762): 83%, Critical (CVSS 9.8), known exploited
- [CVE-2018-13382](https://www.precursorintelligence.com/what-is/cve-2018-13382): 82%, Critical (CVSS 9.1), known exploited
- [CVE-2016-1909](https://www.precursorintelligence.com/what-is/cve-2016-1909): 71%, Critical (CVSS 9.8)
- [CVE-2025-59718](https://www.precursorintelligence.com/what-is/cve-2025-59718): 68%, Critical (CVSS 9.8), known exploited
- [CVE-2018-13380](https://www.precursorintelligence.com/what-is/cve-2018-13380): 62%, Medium (CVSS 6.1)

## Questions

### How many vulnerabilities does FortiOS have?

We track 240 published vulnerabilities listed under the name FortiOS, across 278 versions. The most recent FortiOS flaw added to the known-exploited list is CVE-2025-25249, on 9 September 2026.

### Which FortiOS vulnerabilities are being exploited?

18 are on the list of flaws known to be exploited. The most recently added are CVE-2025-25249, CVE-2025-59718 and CVE-2019-6693.

### Why are newer FortiOS flaws missing from this page?

Fortinet also lists FortiOS under more specific names, such as FortiOS IPS Engine. Flaws listed only under those names are counted on their own pages, not here. Open the release you run to see its own list.

### Which versions of FortiOS do the exploited flaws affect?

Each flaw names its own versions, usually as ranges. The newest, CVE-2025-25249, affects 6.4.0 to before 7.0.18, 7.2.0 to before 7.2.12, 7.4.0 to before 7.4.9, 7.6.0 to before 7.6.4. The versions for every exploited flaw are listed on this page.

### How do I get alerts for FortiOS?

Create a Precursor Intelligence account and track FortiOS. We match it against every published flaw, give each one a risk score from 0 to 100 and keep watching, so you hear about new ones as soon as we know, by email, in the app or by webhook.

## Running FortiOS?

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