PT-2021-4663 · Cisco · Cisco Small Business 220 Series Smart Switches

Qian Chen · Published 2021-10-06 · Updated 2021-10-14 · CVE-2021-34780

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Cisco Small Business 220 Series Smart Switches (affected versions not specified)

Description The issue is related to the implementation of the Link Layer Discovery Protocol (LLDP) in the firmware of Cisco Small Business 220 Series Smart Switches. It involves a buffer overflow in memory, which can be exploited by sending specially crafted malicious LLDP packets. This could allow a remote attacker to cause a denial of service or execute arbitrary code on the affected device. An attacker must be in the same broadcast domain as the affected device to exploit these vulnerabilities.

Recommendations For Cisco Small Business 220 Series Smart Switches, update the firmware to the version released by Cisco that addresses these vulnerabilities. As a temporary workaround, consider restricting access to the LLDP protocol to minimize the risk of exploitation.

Fix

Buffer Overflow

Weakness Enumeration

CWE-120

Related Identifiers

BDU:2021-05356

CVE-2021-34780

Affected Products

Cisco Small Business 220 Series Smart Switches

References · 4

• https://bdu.fstec.ru/vul/2021-05356 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-34780 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-34780 · Security Note