CVE-2021-26111: Fortinet Fortiswitch

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

A missing release of memory after effective lifetime vulnerability in FortiSwitch 6.4.0 to 6.4.6, 6.2.0 to 6.2.6, 6.0.0 to 6.0.6, 3.6.11 and below may allow an attacker on an adjacent network to exhaust available memory by sending specifically crafted LLDP/CDP/EDP packets to the device.

Affected products

• Fortinet Fortiswitch: up to and including 3.6.11; from 6.0.0, up to and including 6.0.6; from 6.2.0, up to and including 6.2.6; from 6.4.0, up to and including 6.4.6

Published 2021-06-01. Last modified 2026-06-17.