Fortinet FortiOS Heap-Based Buffer Overflow Vulnerability
- Severity
- Critical9.8CVSS 3.1, Critical
- EPSS
- 99%
- Published
- 2 Jan 2023
- Updated
- 17 Jun 2026
Description
Title, description and vendor guidance are quoted from the source records.
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 7.2.1, 7.0.7 and earlier may allow a remote unauthenticated attacker to execute arbitrary code or commands via specifically crafted requests.
Weakness: CWE-197, CWE-787
Known exploited
Added to CISA KEV on 13 Dec 2022
Federal remediation due date: 3 Jan 2023
Known use in ransomware campaigns
Required action: Apply updates per vendor instructions.
Exploit prediction
99% 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 |
|---|---|---|
| 7.2 | 7.2.0 – 7.2.1 | Fixed after 7.2.1 |
| 7.0 | 7.0.0 – 7.0.7 | Fixed after 7.0.7 |
| 2.0 | 2.0.0 – 2.0.11 | Fixed after 2.0.11 |
| 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 |
|---|---|---|
| 7.2 | 7.2.0 – 7.2.2 | Fixed after 7.2.2 |
| 7.0 | 7.0.0 – 7.0.8 | Fixed after 7.0.8 |
| 6.4 | 6.4.0 – 6.4.10 | Fixed after 6.4.10 |
| 6.2 | 6.2.0 – 6.2.11 | Fixed after 6.2.11 |
| 6.0 | 6.0.0 – 6.0.15 | Fixed after 6.0.15 |
| 5.6 | 5.6.0 – 5.6.14 | Fixed after 5.6.14 |
| 5.4 | 5.4.0 – 5.4.13 | Fixed after 5.4.13 |
| 5.2 | 5.2.0 – 5.2.15 | Fixed after 5.2.15 |
| 5.0 | 5.0.0 – 5.0.14 | Fixed after 5.0.14 |
Versions not listed are stated unaffected by the vendor.
Workaround / Vendor remediation
Vendor remediation · FortiProxy
Please upgrade to FortiOS version 7.2.3 or above Please upgrade to FortiOS version 7.0.9 or above Please upgrade to FortiOS version 6.4.11 or above Please upgrade to FortiOS version 6.2.12 or above Please upgrade to FortiOS version 6.0.16 or above Please upgrade to upcoming FortiOS-6K7K version 7.0.8 or above Please upgrade to FortiOS-6K7K version 6.4.10 or above Please upgrade to FortiOS-6K7K version 6.2.12 or above Please upgrade to FortiOS-6K7K version 6.0.15 or above Please upgrade to FortiProxy version 7.2.2 or above Please upgrade to FortiProxy version 7.0.8 or above Please upgrade to upcoming FortiProxy version 2.0.12 or above
Vendor remediation · FortiOS
Please upgrade to FortiOS version 7.2.3 or above Please upgrade to FortiOS version 7.0.9 or above Please upgrade to FortiOS version 6.4.11 or above Please upgrade to FortiOS version 6.2.12 or above Please upgrade to FortiOS version 6.0.16 or above Please upgrade to upcoming FortiOS-6K7K version 7.0.8 or above Please upgrade to FortiOS-6K7K version 6.4.10 or above Please upgrade to FortiOS-6K7K version 6.2.12 or above Please upgrade to FortiOS-6K7K version 6.0.15 or above Please upgrade to FortiProxy version 7.2.2 or above Please upgrade to FortiProxy version 7.0.8 or above Please upgrade to upcoming FortiProxy version 2.0.12 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