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Fortinet · FortiOS and FortiProxy

CVE-2018-13383

Fortinet FortiOS and FortiProxy Out-of-bounds Write

CISA KEV record

CISA date added
2022-01-10
CISA due date
2022-07-10
Known ransomware use
Known

NVD risk context

6.5 MEDIUM

CVSS is a technical severity score. CISA’s KEV status remains the evidence that this vulnerability is known to be exploited.

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Attack vector
Network
The vulnerable service can be reached remotely over a network.
Attack complexity
Low
Exploitation does not require unusual conditions beyond normal attacker control.
Privileges required
None
The attacker does not need an existing account or privileges.
User interaction
Required
A user must take an action, such as opening a file or link.

Description

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.

NVD reference index

Vendor and remediation references

NVD has tagged these sources as vendor advisories, patches, mitigations, or release notes.

Other NVD references (1)

MITRE CWE context

CWE classification

NVD record timing

NVD record timeline

These dates describe NVD’s record, not CISA’s KEV addition or remediation due date.

NVD published
May 29, 2019, 06:29 PM UTC
When NVD first published this CVE record.
NVD last updated
Jun 17, 2026, 01:39 AM UTC
When NVD last changed its analysis or record data.
Advanced: view the technical CVSS vector

This standardized code is intended for security tools and technical analysts. The plain-language risk summary above explains its main points.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

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CISA notes

https://nvd.nist.gov/vuln/detail/CVE-2018-13383