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CVE-2017-3133

Published: Sep 12, 2017Updated: May 13, 2026 Sources: CVE List NVD BDUCWE-79
6.1MEDIUM
NVD MITRE
EPSS Score
10.7%
Top 4.5%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available
Self-Check
Nuclei · OpenVAS

Description

A Cross-Site Scripting vulnerability in Fortinet FortiOS versions 5.6.0 and earlier allows attackers to execute unauthorized code or commands via the Replacement Message HTML for SSL-VPN.

In plain language

AI Worth attention

CVE-2017-3133 is a web bug in Fortinet FortiOS SSL-VPN (5.6.0 and earlier) where an attacker can inject a malicious web script into the SSL-VPN “Replacement Message” HTML; small businesses should take it seriously because it’s reachable over the network without login, but it does require a user to click/use the affected page.

Executive summary

In Fortinet FortiOS (5.6.0 and earlier), a cross-site scripting (CWE-79) weakness lets an attacker inject malicious script into the SSL-VPN “Replacement Message” HTML, enabling execution of unintended actions in a victim’s browser via network-triggered injection without authentication.

If affected, business impact
Malicious browser actionsSession or login theftAccount compromise riskService reputation damage

What to do now

  1. Check your Fortinet FortiOS version and confirm it is 5.6.0 or earlier, and whether SSL-VPN is enabled.
  2. Review your SSL-VPN “Replacement Message” content/HTML to ensure no unexpected or user-supplied data is being included.
  3. Update FortiOS to a later version as described in Fortinet’s advisory FG-IR-17-104 (the fixed remediation).
Patch / advisory Some work to apply

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-79

Affected Products

Fortinet Inc.
commercial·USaka fortinet
FortiOS
Security Products
fortinet
commercial·USaka forti net
fortios
Security Products
Fortinet, Inc.
commercial·USaka fortinet fortios, fortios
Fortinet FortiOS
Security Products

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

Click technique nodes for MITRE ATT&CK details · drag to pan · Ctrl/⌘ + scroll to zoom, or go fullscreen.

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://nvd.nist.gov/vuln/detail/CVE-2017-3133
nvd.nist.gov
https://www.securityfocus.com/bid/100009
securityfocus.com
https://fortiguard.com/psirt/FG-IR-17-104
fortiguard.com
and 4 more references View all →

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