FortiOS vulnerabilitiesAnd the versions its exploited flaws hit.
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.
The most recent FortiOS flaw added to the known-exploited list is CVE-2025-25249, on 9 September 2026. We keep watching the known-exploited list.
Is FortiOS listed under other names? Yes.
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. If you run one of these, open its page for its own exploited flaws.
Which versions of FortiOS do the exploited flaws hit?
Each exploited flaw lists the versions it affects, usually as ranges. "6.4.0 to before 7.0.18" means from 6.4.0 up to, but not including, 7.0.18. Find your version, then patch.
- CVE-2025-25249Exploited list, 9 Sep 2026
Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
6.4.0 to before 7.0.187.2.0 to before 7.2.127.4.0 to before 7.4.97.6.0 to before 7.6.4 - CVE-2025-59718Exploited list, 16 Dec 2025
Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
7.0.0 to 7.0.177.2.0 to 7.2.117.4.0 to 7.4.87.6.0 to 7.6.3 - CVE-2019-6693Exploited list, 25 Jun 2025
Fortinet FortiOS Use of Hard-Coded Credentials Vulnerability
up to 5.6.106.0.0 to 6.0.66.2.0 - CVE-2025-24472Exploited list, 18 Mar 2025
Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
7.0.0 to before 7.0.17 - CVE-2024-55591Exploited list, 14 Jan 2025
Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
7.0.0 to before 7.0.17 - CVE-2024-23113Exploited list, 9 Oct 2024
Fortinet Multiple Products Format String Vulnerability
7.0.0 to 7.0.137.2.0 to 7.2.67.4.0 to 7.4.2 - CVE-2024-21762Exploited list, 9 Feb 2024
Fortinet FortiOS Out-of-Bound Write Vulnerability
6.0.0 to before 6.0.186.2.0 to before 6.2.166.4.0 to before 6.4.157.0.0 to before 7.0.147.2.0 to before 7.2.77.4.0 to before 7.4.3 - CVE-2023-27997Exploited list, 13 Jun 2023
Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability
6.0.0 to 6.0.166.2.0 to 6.2.136.4.0 to 6.4.127.0.0 to 7.0.117.2.0 to 7.2.4 - CVE-2022-41328Exploited list, 14 Mar 2023
Fortinet FortiOS Path Traversal Vulnerability
6.0.0 to 6.0.166.2.0 to before 6.2.146.4.0 to before 6.4.127.0.0 to before 7.0.107.2.0 to before 7.2.4 - CVE-2022-42475Exploited list, 13 Dec 2022
Fortinet FortiOS Heap-Based Buffer Overflow Vulnerability
5.0.0 to 5.0.145.2.0 to 5.2.155.4.0 to 5.4.135.6.0 to 5.6.146.0.0 to before 6.0.166.2.0 to before 6.2.126.4.0 to before 6.4.117.0.0 to before 7.0.9 - CVE-2022-40684Exploited list, 11 Oct 2022
Fortinet Multiple Products Authentication Bypass Vulnerability
7.0.0 to before 7.0.77.2.0 to before 7.2.2 - CVE-2018-13374Exploited list, 8 Sep 2022
Fortinet FortiOS and FortiADC Improper Access Control Vulnerability
before 6.0.3 - CVE-2018-13383Exploited list, 10 Jan 2022
Fortinet FortiOS and FortiProxy Out-of-bounds Write
5.2.0 to before 5.2.155.4.0 to before 5.4.135.6.0 to before 5.6.116.0.0 to before 6.0.5 - CVE-2018-13382Exploited list, 10 Jan 2022
Fortinet FortiOS and FortiProxy Improper Authorization
5.4.1 to before 5.4.115.6.0 to before 5.6.96.0.0 to before 6.0.5 - CVE-2021-44168Exploited list, 10 Dec 2021
Fortinet FortiOS Arbitrary File Download
before 6.0.146.2.0 to before 6.2.106.4.0 to before 6.4.87.0.0 to before 7.0.3 - CVE-2018-13379Exploited list, 3 Nov 2021
Fortinet FortiOS SSL VPN Path Traversal Vulnerability
5.4.6 to before 5.4.135.6.3 to before 5.6.86.0.0 to before 6.0.5 - CVE-2020-12812Exploited list, 3 Nov 2021
Fortinet FortiOS SSL VPN Improper Authentication Vulnerability
before 6.0.106.2.0 to before 6.2.46.4.0 - CVE-2019-5591Exploited list, 3 Nov 2021
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. These are the ones criminals are using now, so they go first, whatever their severity score says.
- 8.1Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
Fortinet FortiOS, FortiSwitchManager, and FortiSASE contain a heap-based buffer overflow vulnerability that allows an attacker to execute unauthorized code or commands via specially crafted packets.
- 9.8Fortinet Multiple Products Improper Verification of Cryptographic Signature Vulnerability
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...
- 6.5Fortinet FortiOS Use of Hard-Coded Credentials Vulnerability
Fortinet FortiOS contains a use of hard-coded credentials vulnerability that could allow an attacker to cipher sensitive data in FortiOS configuration backup file via knowledge of the hard-coded key.
- 8.1Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
Fortinet FortiOS and FortiProxy contain an authentication bypass vulnerability that allows a remote attacker to gain super-admin privileges via crafted CSF proxy requests.
- 9.8Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
Fortinet FortiOS and FortiProxy contain an authentication bypass vulnerability that may allow an unauthenticated, remote attacker to gain super-admin privileges via crafted requests to Node.js websocket module.
- 9.8Fortinet Multiple Products Format String Vulnerability
Fortinet FortiOS, FortiPAM, FortiProxy, and FortiWeb contain a format string vulnerability that allows a remote, unauthenticated attacker to execute arbitrary code or commands via specially crafted requests.
- 9.8Fortinet FortiOS Out-of-Bound Write Vulnerability
Fortinet FortiOS contains an out-of-bound write vulnerability that allows a remote unauthenticated attacker to execute code or commands via specially crafted HTTP requests.
- 9.8Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability
Fortinet FortiOS and FortiProxy SSL-VPN contain a heap-based buffer overflow vulnerability which can allow an unauthenticated, remote attacker to execute code or commands via specifically crafted requests.
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. A high severity score on its own doesn't tell you that. Flaws shared by many other makers' products are left out.
- >99%
An Improper Limitation of a Pathname to a Restricted Directory ("Path Traversal") in Fortinet FortiOS 6.0.0 to 6.0.4, 5.6.3 to 5.6.7 and 5.4.6 to 5.4.12 and FortiProxy 2.0.0, 1.2.0 to 1.2.8, 1.1.0 to 1.1.6, 1.0.0 to...
- >99%
An authentication bypass using an alternate path or channel [CWE-288] in Fortinet FortiOS version 7.2.0 through 7.2.1 and 7.0.0 through 7.0.6, FortiProxy version 7.2.0 and version 7.0.0 through 7.0.6 and...
- >99%
A heap-based buffer overflow vulnerability [CWE-122] in FortiOS SSL-VPN 7.2.0 through 7.2.2, 7.0.0 through 7.0.8, 6.4.0 through 6.4.10, 6.2.0 through 6.2.11, 6.0.15 and earlier and FortiProxy SSL-VPN 7.2.0 through...
- 94%
An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiProxy version 7.0.0 through 7.0.19 and 7.2.0 through 7.2.12 allows a remote...
- 86%
A heap-based buffer overflow vulnerability [CWE-122] in FortiOS version 7.2.4 and below, version 7.0.11 and below, version 6.4.12 and below, version 6.0.16 and below and FortiProxy version 7.2.3 and below, version...
- 83%
A out-of-bounds write in Fortinet FortiOS versions 7.4.0 through 7.4.2, 7.2.0 through 7.2.6, 7.0.0 through 7.0.13, 6.4.0 through 6.4.14, 6.2.0 through 6.2.15, 6.0.0 through 6.0.17, FortiProxy versions 7.4.0 through...
- 82%
An Improper Authorization vulnerability in Fortinet FortiOS 6.0.0 to 6.0.4, 5.6.0 to 5.6.8 and 5.4.1 to 5.4.10 and FortiProxy 2.0.0, 1.2.0 to 1.2.8, 1.1.0 to 1.1.6, 1.0.0 to 1.0.7 under SSL VPN web portal allows an...
- 71%CVE-2016-1909Critical
Fortinet FortiAnalyzer before 5.0.12 and 5.2.x before 5.2.5; FortiSwitch 3.3.x before 3.3.3; FortiCache 3.0.x before 3.0.8; and FortiOS 4.1.x before 4.1.11, 4.2.x before 4.2.16, 4.3.x before 4.3.17 and 5.0.x before...
- 68%
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...
- 62%CVE-2018-13380Medium
A Cross-site Scripting (XSS) vulnerability in Fortinet FortiOS 6.0.0 to 6.0.4, 5.6.0 to 5.6.7, 5.4.0 to 5.4.12, 5.2 and below and Fortinet FortiProxy 2.0.0, 1.2.8 and below under SSL VPN web portal allows attacker to...
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1 flaw being exploited affects software Acme tracks
Fortinet FortiOS, FortiSwitchManager, and FortiSASE contain a heap-based buffer overflow vulnerability that allows an attacker to execute unauthorized code or commands via specially crafted packets.
- Matched to
- FortiOS on Acme's software list
- What to do
- Patch first, then check for signs of use
Sent to the alert recipients Acme chose. Also in the app and to Acme's webhook.
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.
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.
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.
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.
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.