CVE-2016-6909
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.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 49.9%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
Description
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.
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 49.86% probability · 99th percentile
- Public exploits
- 1 in Exploit-DB · first 19 August 2016
- CISA KEV
- Not listed
- Weakness
- CWE-119
- Affected
- fortinet/fortios · fortinet/fortiswitch
- Source
- cve@mitre.org
EPSS moved from 36.2% on 21 September 2026 to 49.9% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- http://fortiguard.com/advisory/FG-IR-16-023Vendor Advisory
- http://packetstormsecurity.com/files/138387/EGREGIOUSBLUNDER-Fortigate-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
- http://www.securityfocus.com/bid/92523Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1036643Third Party Advisory, VDB Entry
- https://musalbas.com/2016/08/16/equation-group-firewall-operations-catalogue.htmlThird Party Advisory
- https://www.exploit-db.com/exploits/40276/Exploit, Third Party Advisory, VDB Entry
- http://fortiguard.com/advisory/FG-IR-16-023Vendor Advisory
- http://packetstormsecurity.com/files/138387/EGREGIOUSBLUNDER-Fortigate-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
- http://www.securityfocus.com/bid/92523Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1036643Third Party Advisory, VDB Entry
- https://musalbas.com/2016/08/16/equation-group-firewall-operations-catalogue.htmlThird Party Advisory
- https://www.exploit-db.com/exploits/40276/Exploit, Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.