QID 317246

Date Published: 2022-10-19

QID 317246: Cisco Small Business Switches Bypass Configured First-hop Security (FHS) Vulnerability (cisco-sa-VU855201-J3z8CKTX)

Cisco products were disclosed by Cert/CC as part of VU855201, titled L2 network security controls can be bypassed using VLAN 0 stacking and/or 802.3 headers.

Affected Products
250 Series Smart Switches 350 Series Managed Switches 350X Series Stackable Managed Switches 550X Series Stackable Managed Switches Business 250 Series Smart Switches Business 350 Series Managed Switches Note: This is a potential check as the device model cannot be confirmed.

QID Detection Logic (Unauthenticated):
The unauthenticated check tries to fetch the Cisco Smart Switch vulnerable version in response to GET request to an API, but not the model number.

Could allow an adjacent attacker to bypass configured first-hop security (FHS) features on the affected Cisco products.

  • CVSS V3 rated as Medium - 4.7 severity.
  • CVSS V2 rated as Medium - 5 severity.
    • Solution

    Customers are advised to refer to cisco-sa-VU855201-J3z8CKTX for more information.

    Vendor References

    CVEs related to QID 317246

    CVE-2021-27853 | CVE-2021-27861 |
    Software Advisories
    Advisory ID Software Component Link
    cisco-sa-VU855201-J3z8CKTX URL Logo www.cisco.com/c/en/us/support/docs/csa/cisco-sa-VU855201-J3z8CKTX.html#vp
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