Fortinet FortiOS Out-of-Bound Write Vulnerability
- Severity
- Critical9.8CVSS 3.1, Critical
- EPSS
- 83%
- Published
- 9 Feb 2024
- Updated
- 4 Aug 2026
Description
Title, description and vendor guidance are quoted from the source records.
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 7.4.2, 7.2.0 through 7.2.8, 7.0.0 through 7.0.14, 2.0.0 through 2.0.13, 1.2.0 through 1.2.13, 1.1.0 through 1.1.6, 1.0.0 through 1.0.7 allows attacker to execute unauthorized code or commands via specifically crafted requests
Weakness: CWE-787
Known exploited
Added to CISA KEV on 9 Feb 2024
Federal remediation due date: 16 Feb 2024
Known use in ransomware campaigns
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Exploit prediction
83% probability of exploitation in the next 30 days (percentile 100%).
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
What the source states, per branch
Versions matched by Patcharo
Fortinet FortiProxySource: Fortinet (CVE record)
| Branch | Affected | Fixed in |
|---|---|---|
| 7.4 | 7.4.0 – 7.4.2 | Fixed after 7.4.2 |
| 7.2 | 7.2.0 – 7.2.8 | Fixed after 7.2.8 |
| 7.0 | 7.0.0 – 7.0.14 | Fixed after 7.0.14 |
| 2.0 | 2.0.0 – 2.0.13 | Fixed after 2.0.13 |
| 1.2 | 1.2.0 – 1.2.13 | Fixed after 1.2.13 |
| 1.1 | 1.1.0 – 1.1.6 | Fixed after 1.1.6 |
| 1.0 | 1.0.0 – 1.0.7 | Fixed after 1.0.7 |
Versions not listed are stated unaffected by the vendor.
Fortinet FortiOSSource: Fortinet (CVE record)
| Branch | Affected | Fixed in |
|---|---|---|
| 7.4 | 7.4.0 – 7.4.2 | Fixed after 7.4.2 |
| 7.2 | 7.2.0 – 7.2.6 | Fixed after 7.2.6 |
| 7.0 | 7.0.0 – 7.0.13 | Fixed after 7.0.13 |
| 6.4 | 6.4.0 – 6.4.14 | Fixed after 6.4.14 |
| 6.2 | 6.2.0 – 6.2.15 | Fixed after 6.2.15 |
| 6.0 | 6.0.0 – 6.0.17 | Fixed after 6.0.17 |
Versions not listed are stated unaffected by the vendor.
Workaround / Vendor remediation
Vendor remediation · FortiProxy
Please upgrade to FortiProxy version 7.4.3 or above Please upgrade to FortiProxy version 7.2.9 or above Please upgrade to FortiProxy version 7.0.15 or above Please upgrade to FortiProxy version 2.0.14 or above Please upgrade to FortiOS version 7.6.0 or above Please upgrade to FortiOS version 7.4.3 or above Please upgrade to FortiOS version 7.2.7 or above Please upgrade to FortiOS version 7.0.14 or above Please upgrade to FortiOS version 6.4.15 or above Please upgrade to FortiOS version 6.2.16 or above
Vendor remediation · FortiOS
Please upgrade to FortiProxy version 7.4.3 or above Please upgrade to FortiProxy version 7.2.9 or above Please upgrade to FortiProxy version 7.0.15 or above Please upgrade to FortiProxy version 2.0.14 or above Please upgrade to FortiOS version 7.6.0 or above Please upgrade to FortiOS version 7.4.3 or above Please upgrade to FortiOS version 7.2.7 or above Please upgrade to FortiOS version 7.0.14 or above Please upgrade to FortiOS version 6.4.15 or above Please upgrade to FortiOS version 6.2.16 or above
References
Provenance
Every fact on this page comes from the sources below. Nothing is written by an AI.
- Fortinet (CVE record)
- Fortinet (CVE record) · 27 Sept 2026, 23:46 UTC · Parser patcharo-cve5/1.1.0
- CISA Known Exploited Vulnerabilities
- CISA Known Exploited Vulnerabilities · 27 Sept 2026, 23:42 UTC · Parser patcharo-kev/1.0.0
- NVD
- NVD · 27 Sept 2026, 23:44 UTC · Parser patcharo-nvd/1.0.0
- FIRST EPSS
- FIRST EPSS · 27 Sept 2026, 23:46 UTC · Parser patcharo-epss/1.0.0
Last verified: 28 Sept 2026, 02:31 UTC