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CVE-2018-13381

25
FAUCET Score

CVE-2018-13381 is a buffer overflow vulnerability in Fortinet FortiOS (versions 6.0.0-6.0.4, 5.6.0-5.6.7, 5.4 and earlier) and FortiProxy (versions 2.0.0, 1.2.8 and earlier) within the SSL VPN web portal. This high-severity vulnerability (CVSS 7.5) allows an unauthenticated attacker to cause a Denial-of-Service (DoS) by sending specially crafted message payloads. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has received some community discussion and media coverage, indicating awareness.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.2.8CPE matchmatch criteria
cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*
2.0.0CPE matchmatch criteria
cpe:2.3:a:fortinet:fortiproxy:2.0.0:*:*:*:*:*:*:*
<= 5.2.14CPE matchmatch criteria
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
>= 5.4.0, <= 5.4.12CPE matchmatch criteria
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
>= 5.6.0, <= 5.6.10CPE matchmatch criteria
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.75%
Probability of exploitation in next 30 days
EPSS Percentile
75.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0175 is in the 58th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

fortinetvendor investigatingvia nvd_reference
View patch

References

fortiguard.com / advisory/FG-IR-18-387
MitigationVendor Advisory
fortiguard.com / advisory/FG-IR-20-232
Vendor Advisory