CVE-2021-34776: cisco business_220-16p-2g_firmware Classic Buffer Overflow

Vulnerability summary

CVE-2021-34776 is a medium (CVSS 4.3) Classic Buffer Overflow vulnerability in cisco business_220-16p-2g_firmware. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 33.9% of scored vulnerabilities.

Timeline

1. 06-10-2021
   PublishedVulnerability first disclosed.
2. 07-11-2024
   Last modifiedVulnerability information updated.

Description

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.

• CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.