CVE-2021-34776 MEDIUM

CVE-2021-34776: Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabilities

Vendor Cisco
Product Cisco Small Business 200 Series Smart Switches
Weakness CWE-120
Published October 6, 2021
Last update November 7, 2024

CVSS base score

4.3/10
Attack vector Adjacent
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

Multiple vulnerabilities exist in the Link Layer Discovery Protocol (LLDP) implementation for Cisco Small Business 220 Series Smart Switches. An unauthenticated, adjacent attacker could perform the following: Execute code on the affected device or cause it to reload unexpectedly Cause LLDP database corruption on the affected device For more information about these vulnerabilities, see the Details section of this advisory. Note: LLDP is a Layer 2 protocol. To exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent). Cisco has released firmware updates that address these vulnerabilities.

Key dates

02Disclosure timeline

October 6, 2021 CVE published
November 7, 2024 Record updated