high
8.8
CWE
120
Advisory Published
Updated

CVE-2021-34780: Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabilities

First published: Wed Oct 06 2021(Updated: )

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.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Business 220-8t-e-2g<=1.2.0.6
Cisco Business 220-8t-e-2g Firmware
Cisco Business 220-8p-e-2g<=1.2.0.6
Cisco Business 220-8p-e-2g Firmware
Cisco Business 220-8fp-e-2g Firmware<=1.2.0.6
Cisco Business 220-8fp-e-2g Firmware
Cisco Business 220-16T-2G Firmware<=1.2.0.6
Cisco Business 220-16t-2g Firmware
Cisco Business 220-16p-2g Firmware<=1.2.0.6
Cisco Business 220-16p-2g Firmware
Cisco Business 220-24t-4g Firmware<=1.2.0.6
Cisco Business 220-24t-4g Firmware
Cisco Business 220-24p-4g Firmware<=1.2.0.6
Cisco Business 220-24p-4g Firmware
Cisco Business 220-24fp-4g Firmware<=1.2.0.6
Cisco Business 220-24t-4g Firmware
Cisco Business 220-48T-4G Firmware<=1.2.0.6
Cisco Business 220-48t-4g Firmware
Cisco Business 220 Series Firmware<=1.2.0.6
Cisco Business 220-48p-4g
Cisco Business 220-24t-4x<=1.2.0.6
Cisco Business 220-24t-4x Firmware
Cisco Business 220-24p-4x<=1.2.0.6
Cisco Business 220-24p-4x Firmware
Cisco Business 220-24fp-4x Firmware<=1.2.0.6
Cisco Business 220-24fp-4x Firmware
Cisco Business 220 Series Firmware<=1.2.0.6
Cisco Business 220-48t-4x Firmware
Cisco Business 220-48p-4x Firmware<=1.2.0.6
Cisco Business 220-48p-4x Firmware
Cisco Business 220-48fp-4x Firmware<=1.2.0.6
Cisco Business 220-48fp-4x Firmware

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-34780?

    CVE-2021-34780 is a vulnerability in the Link Layer Discovery Protocol (LLDP) implementation for Cisco Small Business 220 Series Smart Switches.

  • What is the severity of CVE-2021-34780?

    CVE-2021-34780 has a severity value of 8.8, which is classified as high severity.

  • How can an attacker exploit CVE-2021-34780?

    An unauthenticated, adjacent attacker could execute code on the affected device or cause it to reload unexpectedly. They could also cause LLDP database corruption, leading to denial of service conditions.

  • Which software versions are affected by CVE-2021-34780?

    Cisco Business 220-8t-e-2g Firmware version 1.2.0.6 and earlier are affected.

  • How can I mitigate CVE-2021-34780?

    Cisco has released firmware updates to address this vulnerability. It is recommended to update to the latest firmware version to mitigate the risk.

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