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Fencer Intel
critical 9.8

CVE-2016-6909 in the critical feed json

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 bef…

published 2016-08-24 10 y ago modified 2026-06-17 4 mo ago also EUVD-2016-7794

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
49.9%
EPSS 49.9% chance of exploitation in 30 days, percentile 98%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

  • fortinet fortios 4.1.11, 4.2.13, 4.3.9

Timeline

  1. First public exploit (EDB-40276)
  2. Published

Exploit prediction

49.86% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-40276 Fortigate Firewalls - 'EGREGIOUSBLUNDER' Remote Code Execution webapps, 2016-08-19
  • packetstormsecurity.com http://packetstormsecurity.com/files/138387/EGREGIOUSBLUNDER-Fortigate-Remote-Code-Execution.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.