# CVE-2018-13383: Fortinet FortiOS and FortiProxy Out-of-bounds Write

> CVE-2018-13383: Fortinet FortiOS and FortiProxy Out-of-bounds Write. CVSS 4.3 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2018-13383
Last updated: 2025-10-21T23:45:36Z

- Published: 2019-05-29 17:20 UTC · Updated: 2025-10-21 23:45 UTC · Assigner: fortinet
- CVSS: 4.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
- EPSS: 33.6%, 98th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2022-01-10, federal due date 2022-07-10, ransomware use: Known

## Description

A heap buffer overflow in Fortinet FortiOS 6.0.0 through 6.0.4, 5.6.0 through 5.6.10, 5.4.0 through 5.4.12, 5.2.14 and earlier and FortiProxy 2.0.0, 1.2.8 and earlier in the SSL VPN web portal may cause the SSL VPN web service termination for logged in users due to a failure to properly handle javascript href data when proxying webpages.

## CISA required action

Apply updates per vendor instructions.

## Affected vendors and products

- Fortinet: Fortinet FortiOS and FortiProxy

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2018-13383)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2018-13383)
- [https://fortiguard.com/advisory/FG-IR-18-388](https://fortiguard.com/advisory/FG-IR-18-388)
- [https://fortiguard.com/advisory/FG-IR-20-229](https://fortiguard.com/advisory/FG-IR-20-229)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2018-13383 · Markdown: https://rewindex.com/cve/CVE-2018-13383.md · JSON: https://rewindex.com/api/v1/cves/CVE-2018-13383 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:45:11.221Z