CVE-2006-1966: Fortinet FORTINET28

Medium severity, CVSS 5.0. EPSS: 1.6% chance of exploitation in the next 30 days.

An unspecified Fortinet product, possibly Fortinet28, allows remote attackers to cause a denial of service via a "small synflood" to the SMTP port (TCP port 25), as demonstrated by a 10-microsecond wait between sending packets. NOTE: this issue has been disputed in followup posts that suggest that a protection feature is triggering a RST.

Affected products

• Fortinet FORTINET28: any version

Published 2006-04-21. Last modified 2026-06-16.