Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability
- Severity
- Critical9.8CVSS 3.1, Critical
- EPSS
- 86%
- Published
- 13 Jun 2023
- Updated
- 31 Jul 2026
Description
Title, description and vendor guidance are quoted from the source records.
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 7.0.9 and below, version 2.0.12 and below, version 1.2 all versions, version 1.1 all versions SSL-VPN may allow a remote attacker to execute arbitrary code or commands via specifically crafted requests.
Weakness: CWE-122, CWE-787
Known exploited
Added to CISA KEV on 13 Jun 2023
Federal remediation due date: 4 Jul 2023
Known use in ransomware campaigns
Required action: Apply updates per vendor instructions.
Exploit prediction
86% 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 – 7.2.3 | Fixed after 7.2.3 |
| 7.0 | 7.0.0 – 7.0.9 | Fixed after 7.0.9 |
| 2.0 | 2.0.0 – 2.0.12 | Fixed after 2.0.12 |
| 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 |
Versions not listed are stated unaffected by the vendor.
Fortinet FortiOSSource: Fortinet (CVE record)
| Branch | Affected | Fixed in |
|---|---|---|
| 7.2 | 7.2.0 – 7.2.4 | Fixed after 7.2.4 |
| 7.0 | 7.0.0 – 7.0.11 | Fixed after 7.0.11 |
| 6.4 | 6.4.0 – 6.4.12 | Fixed after 6.4.12 |
| 6.2 | 6.2.0 – 6.2.13 | Fixed after 6.2.13 |
| 6.0 | 6.0.0 – 6.0.16 | Fixed after 6.0.16 |
Versions not listed are stated unaffected by the vendor.
Affected products
- Fortinet FortiOS-6K7K · 7.0.10, 7.0.5, 6.4.12, 6.4.10, 6.4.8, 6.4.6, 6.4.2, 6.2.9 ≤ 6.2.13, 6.2.6 ≤ 6.2.7, 6.2.4, 6.0.12 ≤ 6.0.16, 6.0.10
Workaround / Vendor remediation
Vendor remediation · FortiProxy
Please upgrade to FortiOS-6K7K version 7.0.12 or above Please upgrade to FortiOS-6K7K version 6.4.13 or above Please upgrade to FortiOS-6K7K version 6.2.15 or above Please upgrade to FortiOS-6K7K version 6.0.17 or above Please upgrade to FortiProxy version 7.2.4 or above Please upgrade to FortiProxy version 7.0.10 or above Please upgrade to FortiOS version 7.4.0 or above Please upgrade to FortiOS version 7.2.5 or above Please upgrade to FortiOS version 7.0.12 or above Please upgrade to FortiOS version 6.4.13 or above Please upgrade to FortiOS version 6.2.14 or above Please upgrade to FortiOS version 6.0.17 or above
Vendor remediation · FortiOS
Please upgrade to FortiOS-6K7K version 7.0.12 or above Please upgrade to FortiOS-6K7K version 6.4.13 or above Please upgrade to FortiOS-6K7K version 6.2.15 or above Please upgrade to FortiOS-6K7K version 6.0.17 or above Please upgrade to FortiProxy version 7.2.4 or above Please upgrade to FortiProxy version 7.0.10 or above Please upgrade to FortiOS version 7.4.0 or above Please upgrade to FortiOS version 7.2.5 or above Please upgrade to FortiOS version 7.0.12 or above Please upgrade to FortiOS version 6.4.13 or above Please upgrade to FortiOS version 6.2.14 or above Please upgrade to FortiOS version 6.0.17 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