Is CVE-2017-7739 being actively exploited?

CVE-2017-7739 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2017-7739?

CVE-2017-7739 has a CVSS 3.0 base score of 6.1 (MEDIUM).

CVE-2017-7739

MEDIUM · CVSS 6.1EPSS 1.1%EU EUVD

A reflected Cross-site Scripting (XSS) vulnerability in web proxy disclaimer response web pages in Fortinet FortiOS 5.6.0, 5.4.0 to 5.4.5, 5.2.0 to 5.2.11 allows an unauthenticated attacker to inject arbitrary web script or HTML in the context of the victim's browser via sending a maliciously crafted URL to the victim.

Key facts

CVSS score: 6.1 (v3.0)
Severity: MEDIUM
CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
EPSS score: 1.1% (64th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2017-16714)
Published: November 13, 2017
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2017-16714 in the EU Vulnerability Database. Last updated in EUVD on October 25, 2024.

View on the EU Vulnerability Database

Affected products

fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios
fortinet / fortios

Certified products that may be affected

2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

FortiOS 5.6 - Fortinet, Inc. - FIPS 140 3639 - historical
FortiOS 5.2 - Fortinet, Inc. - FIPS 140 2765 - historical

References

http://www.securityfocus.com/bid/101679(Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1039741(Third Party Advisory, VDB Entry)
https://fortiguard.com/advisory/FG-IR-17-168(Issue Tracking, Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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