PT-2021-4955 · Cisco · Cisco Small Business 220 Series Smart Switches

Qian Chen · Published 2021-10-06 · Updated 2021-11-06 · CVE-2021-34775

Positive Technologies (AI Summary)

CVSS v3.1

4.3

Medium

Base vector

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

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 Link Layer Discovery Protocol (LLDP) implementation and involves a buffer overflow due to lack of input validation. An unauthenticated, adjacent attacker could execute code on the affected device, cause it to reload unexpectedly, or corrupt the LLDP database. The attacker must be in the same broadcast domain as the affected device to exploit these vulnerabilities.

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:2021-05709

CVE-2021-34775

Affected Products

Cisco Small Business 220 Series Smart Switches

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2021-34778#range-7008194 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-34775 · Security Note
• https://osv.dev/vulnerability/CVE-2021-34775 · Vendor Advisory
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-05709 · Security Note
• https://t.me/cvenotify/22029 · Telegram Post
• https://t.me/cibsecurity/30112 · Telegram Post