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9.8

FortiOS/FortiSwitch can be hijacked through crafted web request

CVE-2016-6909 · published 10 years ago
Summary

Certain older versions of FortiOS and FortiSwitch have a problem in the way they read web‑browser cookies. An attacker who sends a specially crafted web request could make the device run their own code, giving them control of the system. Install the latest firmware from Fortinet for the affected devices as soon as possible.

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 >= 4.1.0, < 4.1.11
>= 4.2.0, < 4.2.13
>= 4.3.0, < 4.3.9
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
fortinet fortiswitch <= 3.4.2
cpe:2.3:o:fortinet:fortiswitch:*:*:*:*:*:*:*:*
Original advisory text
Buffer overflow in the Cookie parser in Fortinet FortiOS 4.x before 4.1.11, 4.2.x before 4.2.13, and 4.3.x before 4.3.9 and FortiSwitch before 3.4.3 allows remote attackers to execute arbitrary cod...
Buffer overflow in the Cookie parser in Fortinet FortiOS 4.x before 4.1.11, 4.2.x before 4.2.13, and 4.3.x before 4.3.9 and FortiSwitch before 3.4.3 allows remote attackers to execute arbitrary code via a crafted HTTP request, aka EGREGIOUSBLUNDER.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker full control (estimated)
Severity
9.8 Critical
Exploitation
50% chance of attack within 30 days
Type
CWE-119Buffer Overflow
Timeline
Published24 Aug 2016
Updated29 Sep 2026
First seen29 Sep 2026
Sources
CVE-2016-6909 · NVD
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