CVE-2018-13383
Fortinet FortiOS and FortiProxy Out-of-bounds Write is confirmed as actively exploited and is listed in the CISA KEV catalog.
Required action
Apply updates per vendor instructions.
CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2018-13383
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.
Severity
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:LExploitation Context
as of October 14, 2026- CISA added CVE-2018-13383 to the KEV catalog 957 days after its CVE record was published.
- It is one of 31 Fortinet entries in the CISA KEV catalog, and one of 5 added in 2022.
- Its current EPSS score (33.6%) is higher than that of 43% of CISA KEV entries.
Affected Products
| Vendor | Product | Affected versions |
|---|---|---|
| Fortinet | Fortinet Fortinet FortiOS and FortiProxy | 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, FortiProxy 2.0.0, 1.2.8 and earlier |
References
2 LinksRecord Details
More from Fortinet
Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
Fortinet FortiOS and FortiProxy Improper Authorization
Fortinet FortiOS and FortiProxy Authentication Bypass Vulnerability
Fortinet FortiOS SSL VPN Path Traversal Vulnerability
CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.