CVSS 3.1
4.3 mediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:NCVE-2021-34776
Medium (4.3) in cisco. EPSS 0.4% chance of exploitation in the next 30 days.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 35% of CVEs (scores of 2026-10-31)
- CWE
- CWE-120
- Published
- Modified
- Record from
- the NVD, synced
Affected
- cisco:business_220-16p-2g_firmware
- cisco:business_220-16t-2g_firmware
- cisco:business_220-24fp-4g_firmware
- cisco:business_220-24fp-4x_firmware
- cisco:business_220-24p-4g_firmware
- cisco:business_220-24p-4x_firmware
- cisco:business_220-24t-4g_firmware
- cisco:business_220-24t-4x_firmware
- cisco:business_220-48fp-4x_firmware
- cisco:business_220-48p-4g_firmware
- cisco:business_220-48p-4x_firmware
- cisco:business_220-48t-4g_firmware
- cisco:business_220-48t-4x_firmware
- cisco:business_220-8fp-e-2g_firmware
- cisco:business_220-8p-e-2g_firmware
- cisco:business_220-8t-e-2g_firmware