Vulnerability Details : 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.
Vulnerability category: OverflowExecute code
Products affected by CVE-2021-34776
- cpe:2.3:o:cisco:business_220-8t-e-2g_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:business_220-8p-e-2g_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:business_220-8fp-e-2g_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:business_220-16t-2g_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:business_220-16p-2g_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:business_220-24t-4g_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:business_220-24p-4g_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:business_220-24fp-4g_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:business_220-48t-4g_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:business_220-48p-4g_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:business_220-24t-4x_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:business_220-24p-4x_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:business_220-24fp-4x_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:business_220-48t-4x_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:business_220-48p-4x_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:cisco:business_220-48fp-4x_firmware:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-34776
0.07%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 31 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-34776
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
2.9
|
LOW | AV:A/AC:M/Au:N/C:N/I:P/A:N |
5.5
|
2.9
|
NIST | |
|
4.3
|
MEDIUM | CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
2.8
|
1.4
|
Cisco Systems, Inc. | |
|
4.3
|
MEDIUM | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
2.8
|
1.4
|
NIST |
CWE ids for CVE-2021-34776
-
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, leading to a buffer overflow.Assigned by:
- nvd@nist.gov (Primary)
- ykramarz@cisco.com (Secondary)
References for CVE-2021-34776
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb220-lldp-multivuls-mVRUtQ8T
Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol VulnerabilitiesVendor Advisory
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