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CVE-2021-26111

MEDIUM

6.5

CVSS Score

Published: June 1, 2021 at 07:57 PM UTC

Updated: June 17, 2026 at 03:42 AM UTC

1 product affected across 1 vendorFortiSwitch

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

FortiSwitch · Fortinet

95%

v ≤ 3.6.116.0.0 ≤ v ≤ 6.0.66.2.0 ≤ v ≤ 6.2.66.4.0 ≤ v ≤ 6.4.6

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

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

References (1)

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

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

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMfortinet

Attack Vector: ADJACENT_NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-401

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