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CVE-2017-17543

19
FAUCET Score

CVE-2017-17543 describes a critical vulnerability in Fortinet FortiClient for Windows, Mac, and Linux versions 5.6.0 and below, where VPN authentication credentials are unsafely encrypted. This is due to the use of a static encryption key and weak algorithms, allowing an attacker to potentially decrypt sensitive user data. With a CVSS score of 7.5 (HIGH), this vulnerability is easily exploitable over the network with low attack complexity, leading to a high impact on confidentiality. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 5.6.0CPE matchmatch criteria
cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:windows:*:*
<= 5.6.0CPE matchmatch criteria
cpe:2.3:a:fortinet:forticlient:*:*:*:*:*:macos:*:*
<= 4.4.2335CPE matchmatch criteria
cpe:2.3:a:fortinet:forticlient_sslvpn_client:*:*:*:*:*:linux:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.45%
Probability of exploitation in next 30 days
EPSS Percentile
36.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0045 is in the 15th percentile among its peer group of 51,455 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

fortiguard.com / advisory/FG-IR-17-214