medium
4.3
CWE
120
Advisory Published
Updated

CVE-2021-34778: 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 the vulnerability severity of CVE-2021-34778?

    The vulnerability severity of CVE-2021-34778 is medium.

  • How can an attacker exploit CVE-2021-34778?

    An attacker can exploit CVE-2021-34778 by executing code on the affected device or causing it to reload unexpectedly.

  • Which Cisco products are affected by CVE-2021-34778?

    Cisco Small Business 220 Series Smart Switches firmware versions up to and including 1.2.0.6 are affected by CVE-2021-34778.

  • How can I fix CVE-2021-34778?

    To fix CVE-2021-34778, update the firmware of Cisco Small Business 220 Series Smart Switches to a version that is not vulnerable.

  • Where can I find more information about CVE-2021-34778?

    You can find more information about CVE-2021-34778 in the Cisco Security Advisory.

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