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CVE-2018-9191

24
FAUCET Score

CVE-2018-9191 describes a local privilege escalation vulnerability in Fortinet FortiClient for Windows versions 6.0.4 and earlier. An attacker can exploit this by manipulating the named pipe used for FortiClient updates, enabling unauthorized code execution with elevated privileges. Rated 7.8 HIGH on CVSS, this vulnerability requires local access but has low attack complexity, potentially leading to high impact on confidentiality, integrity, and availability. Despite its severity, there is currently no public exploit code (Metasploit, Nuclei, ExploitDB), nor is it listed on CISA's KEV catalog, and it has received minimal community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 6.0.4CPE matchmatch criteria
cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:windows:*:*

CVSS Data

CVSS version used by this source: 3.0

7.8HIGH

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.34%
Probability of exploitation in next 30 days
EPSS Percentile
26.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0034 is in the 64th percentile among its peer group of 17,061 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 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-18-108
Vendor Advisory