CVE-2018-13383
Fortinet FortiOS and FortiProxy Out-of-bounds Write
What is affected
| Vendor | Fortinet |
|---|---|
| Product | FortiOS and FortiProxy |
| Weakness | CWE-787 |
The vulnerability
A heap buffer overflow in Fortinet FortiOS and FortiProxy may cause the SSL VPN web service termination for logged in users.
Required action
Apply updates per vendor instructions.
US federal civilian agencies were required to act by 10 July 2022 under BOD 22-01. The deadline is a compliance date, not a measure of severity — it says nothing about how dangerous the flaw is to anyone else.
Ransomware
CISA records this vulnerability as having been used in ransomware campaigns. That is a confirmed observation, not an assessment of likelihood.
Where this comes from
Every field on this page is taken from the CISA Known Exploited Vulnerabilities catalog, last synced 11 Nov 2026, 21:30. Nothing here is our own assessment. For the technical scoring, see the NVD record below.
More from Fortinet
Fortinet Multiple Products
Fortinet Multiple Products Path Traversal Vulnerability
CVE-2026-104286Fortinet FortiMail
Fortinet FortiMail Path Traversal Vulnerability
CVE-2025-25249Fortinet Multiple Products
Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
CVE-2025-68686Fortinet FortiOS
Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability