Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabilities
Priority LOW 20CWE-120Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00411 35th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Cisco | Cisco Small Business 200 Series Smart Switches | all versions | — | No fix listed | CNA |
- Cisco Small Business 200 Series Smart Switches VendorCisco Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 32
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:business_220-8t-e-2g_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-8t-e-2g:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:business_220-8p-e-2g_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-8p-e-2g:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:business_220-8fp-e-2g_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-8fp-e-2g:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:business_220-16t-2g_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-16t-2g:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:business_220-16p-2g_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-16p-2g:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:business_220-8t-e-2g_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-8t-e-2g:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:business_220-8p-e-2g_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-8p-e-2g:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:business_220-8fp-e-2g_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-8fp-e-2g:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:business_220-16t-2g_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-16t-2g:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:business_220-16p-2g_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-16p-2g:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Show 22 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:cisco:business_220-24t-4g_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-24t-4g:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:business_220-24p-4g_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-24p-4g:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:business_220-24fp-4g_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-24fp-4g:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:business_220-48t-4g_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-48t-4g:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:business_220-48p-4g_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-48p-4g:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:business_220-24t-4x_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-24t-4x:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:business_220-24p-4x_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-24p-4x:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:business_220-24fp-4x_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-24fp-4x:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:business_220-48t-4x_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-48t-4x:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:business_220-48p-4x_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-48p-4x:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
| cpe:2.3:o:cisco:business_220-48fp-4x_firmware:*:*:*:*:*:*:*:* | up to 1.2.0.6 | Vulnerable | Cisco |
| cpe:2.3:h:cisco:business_220-48fp-4x:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Cisco |
- cpe:2.3:o:cisco:business_220-24t-4g_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-24t-4g:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:business_220-24p-4g_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-24p-4g:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:business_220-24fp-4g_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-24fp-4g:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:business_220-48t-4g_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-48t-4g:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:business_220-48p-4g_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-48p-4g:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:business_220-24t-4x_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-24t-4x:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:business_220-24p-4x_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-24p-4x:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:business_220-24fp-4x_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-24fp-4x:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:business_220-48t-4x_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-48t-4x:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:business_220-48p-4x_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-48p-4x:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
- cpe:2.3:o:cisco:business_220-48fp-4x_firmware:*:*:*:*:*:*:*:* Versions up to 1.2.0.6 Vulnerable ·Cisco
- cpe:2.3:h:cisco:business_220-48fp-4x:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Cisco
Remediation
No fixed version listed by the sources yet.
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Advisory ·
Cisco Small Business 200 Series Smart Switches — 20211006 Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabilities
6 records Highest priority Priority LOW 6 LOW
Other records, highest priority first
- TI-2021-13778 Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol VulnerabilitiesPriority LOW 39
- TI-2021-13777 Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol VulnerabilitiesPriority LOW 39
- TI-2021-13775 Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol VulnerabilitiesPriority LOW 20
Timeline
- 2026-10-02 Threatist record created from CVE-2021-34778
- 2026-10-03 Alias added: GHSA-jr9h-58gc-725g
References
More Cisco Business 220-16p-2g Firmware vulnerabilities
- TI-2021-13778 Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabilities CVSS 3.1HIGH 8.8
- TI-2021-13777 Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabilities CVSS 3.1HIGH 8.8
- TI-2021-13755 Cisco Business 220 Series Smart Switches Static Key and Password Vulnerabilities CVSS 3.1MEDIUM 5.5
- TI-2021-13743 Cisco Business 220 Series Smart Switches Static Key and Password Vulnerabilities CVSS 3.1MEDIUM 4.9
- TI-2021-13775 Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabilities CVSS 3.1MEDIUM 4.3
- TI-2021-13774 Cisco Small Business 220 Series Smart Switches Link Layer Discovery Protocol Vulnerabilities CVSS 3.1MEDIUM 4.3
Sources
- CVE-2021-34778 · CVE Program
- CVE-2021-34778 · NVD
- FIRST EPSS
- GHSA-jr9h-58gc-725g · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences