Vulnerability Intelligence Report
Fortinet FortiOS and FortiProxy Out-of-bounds Write
CVE-2018-13383
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 KEV
SSVC: Active Exploitation
CVSS Base Score
4.3
MEDIUM
Exploitability:2.9
Impact Score:1.5
EPSS Probability:33.65%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
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Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-787 ↗CWE-787 Out-of-bounds Write
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| 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 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Fortinet, Inc. · Vendor · USA |
| Reserved | 2018-07-06T00:00:00 |
| Published | 2019-05-29T17:20:03 |
| Patch Date | 2019-04-02 |
| Last Updated | 2025-10-21T23:45:36 |
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