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CVE-2016-3978

33
FAUCET Score

CVE-2016-3978 describes an open redirect and cross-site scripting (XSS) vulnerability in the Web User Interface (WebUI) of FortiOS versions 5.0.x, 5.2.x, and 5.4.x. An unauthenticated remote attacker could exploit this by manipulating the "redirect" parameter in the login page to redirect users to arbitrary websites, facilitating phishing or XSS attacks. The vulnerability carries a CVSSv3 score of 6.1 (Medium), indicating a low attack complexity and requiring user interaction, but potentially impacting confidentiality and integrity. Its EPSS score is low, suggesting a low likelihood of exploitation in the wild. There is no evidence of active exploitation, nor are there Metasploit modules or ExploitDB entries. However, Nuclei templates exist for detecting this vulnerability. Community discussion and media coverage are minimal, which is typical for a large percentage of CVEs.

Impacted Technologies

VendorProductVersion(s)CPE
5.0.0CPE matchmatch criteria
cpe:2.3:o:fortinet:fortios:5.0.0:*:*:*:*:*:*:*
5.0.1CPE matchmatch criteria
cpe:2.3:o:fortinet:fortios:5.0.1:*:*:*:*:*:*:*
5.0.2CPE matchmatch criteria
cpe:2.3:o:fortinet:fortios:5.0.2:*:*:*:*:*:*:*
5.0.3CPE matchmatch criteria
cpe:2.3:o:fortinet:fortios:5.0.3:*:*:*:*:*:*:*
5.0.4CPE matchmatch criteria
cpe:2.3:o:fortinet:fortios:5.0.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
6.87%
Probability of exploitation in next 30 days
EPSS Percentile
93.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Nuclei: CVE-2016-3978 · Jan 29, 2022
This CVE's current EPSS score of 0.0687 is in the 97th percentile among its peer group of 26,221 CVEs.

Social Chatter

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

Vendor Patches (1)

fortinetvendor investigatingvia nvd_reference
View patch

References

seclists.org / fulldisclosure/2016/Mar/68
fortiguard.com / advisory/fortios-open-redirect-vulnerability
Vendor Advisory
securitytracker.com / id/1035332