PT-2021-4656 · Cisco · Cisco Small Business 220 Series Smart Switches

Qian Chen · Published 2021-10-06 · Updated 2021-10-14 · CVE-2021-34779

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 an unauthenticated, adjacent attacker. The attacker can execute code on the affected device, cause it to reload unexpectedly, or corrupt the LLDP database by sending specially crafted malicious LLDP packets. Note that to exploit these vulnerabilities, an attacker must be in the same broadcast domain as the affected device, meaning they must be Layer 2 adjacent.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Buffer Overflow

Weakness Enumeration

CWE-120

Related Identifiers

BDU:2021-05349

CVE-2021-34779

Affected Products

Cisco Small Business 220 Series Smart Switches

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2021-34779 · Security Note
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-34779 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-05349 · Security Note
• https://t.me/cibsecurity/30121 · Telegram Post