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7.5

FortiOS SSL VPN can be crashed by remote attacker

CVE-2019-15705 · published 6 years ago
Summary

The SSL VPN feature in FortiOS versions up to 6.2.1 and 6.0.6 may stop working if someone sends a specially crafted web request. This can disconnect remote users and interrupt secure access. Apply the latest FortiOS update that fixes the input‑validation problem or block unauthorized access to the VPN portal.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
fortinet fortios <= 6.0.6
>= 6.2.0, <= 6.2.1
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
Original advisory text
An Improper Input Validation vulnerability in the SSL VPN portal of FortiOS versions 6.2.1 and below, and 6.0.6 and below may allow an unauthenticated remote attacker to crash the SSL VPN service b...
An Improper Input Validation vulnerability in the SSL VPN portal of FortiOS versions 6.2.1 and below, and 6.0.6 and below may allow an unauthenticated remote attacker to crash the SSL VPN service by sending a crafted POST request.
References
Fix within
Internet-facing 14 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically
  • Gives an attacker partial control
Severity
7.5 High
Exploitation
2% chance of attack within 30 days
Type
CWE-20Improper Input Validation
Timeline
Published27 Nov 2019
Updated3 Nov 2026
First seen29 Sep 2026
Sources
CVE-2019-15705 · NVD
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