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CVE-2021-34776

MEDIUMCVSS 4.3/10EPSS 0.40%

Last modified

CVE-2021-34776 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. 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. EPSS estimates a 0.40% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
4.3/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

EPSS Probability
0.40%

31.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoBusiness 220-8t-E-2g Firmware<= 1.2.0.6
CiscoBusiness 220-8p-E-2g Firmware<= 1.2.0.6
CiscoBusiness 220-8fp-E-2g Firmware<= 1.2.0.6
CiscoBusiness 220-16t-2g Firmware<= 1.2.0.6
CiscoBusiness 220-16p-2g Firmware<= 1.2.0.6
CiscoBusiness 220-24t-4g Firmware<= 1.2.0.6
CiscoBusiness 220-24p-4g Firmware<= 1.2.0.6
CiscoBusiness 220-24fp-4g Firmware<= 1.2.0.6
CiscoBusiness 220-48t-4g Firmware<= 1.2.0.6
CiscoBusiness 220-48p-4g Firmware<= 1.2.0.6
CiscoBusiness 220-24t-4x Firmware<= 1.2.0.6
CiscoBusiness 220-24p-4x Firmware<= 1.2.0.6
CiscoBusiness 220-24fp-4x Firmware<= 1.2.0.6
CiscoBusiness 220-48t-4x Firmware<= 1.2.0.6
CiscoBusiness 220-48p-4x Firmware<= 1.2.0.6
CiscoBusiness 220-48fp-4x Firmware<= 1.2.0.6

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-34776?
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.
How severe is CVE-2021-34776?
CVE-2021-34776 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.40% probability of exploitation in the next 30 days.
How do I fix CVE-2021-34776?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-34776?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST