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Vulnerability record · CVE-2021-26111 · published 1 June 2021

CVE-2021-26111: Fortinet fortiswitch memory leak vulnerability

Fortinet · Fortiswitch

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.

6.5 CVSS 3.1 Medium EPSS 0.38% · top 69.9% CWE-401 · Memory leak
6.5CVSS 3.1 base score, v2 3.3
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://fortiguard.com/advisory/FG-IR-21-026 Vendor Advisory
https://fortiguard.com/advisory/FG-IR-21-026 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-26111), CISA KEV, FIRST EPSS (scores of 2026-10-10). This page is refreshed as NVD updates the record.