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CVE-2021-1228— Cisco Nexus 9000 Series Fabric Switches ACI Mode Fabric Infrastructure VLAN Unauthorized Access Vulnerability

Quick assessment

Affected
Cisco Cisco NX-OS System Software in ACI Mode 11.0(1b)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco Application Policy Infrastructure Controller（APIC）和Cisco Nexus 9000 Series Fabric Switches都是美国思科（Cisco）公司的产品。Cisco Application Policy Infrastructure Controller是一款自动化的基础架构部署和治理解决方案。Cisco Nexus 9000 Series Fabric Switches是一款9000系列光纤交换机。 Cisco Nexus 90

CVSS 7.4 · High EPSS 0.37% · P31
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I. Basic Information for CVE-2021-1228

Vulnerability Information
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Vulnerability Title
Cisco Nexus 9000 Series Fabric Switches ACI Mode Fabric Infrastructure VLAN Unauthorized Access Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the fabric infrastructure VLAN connection establishment of Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) Mode could allow an unauthenticated, adjacent attacker to bypass security validations and connect an unauthorized server to the infrastructure VLAN. This vulnerability is due to insufficient security requirements during the Link Layer Discovery Protocol (LLDP) setup phase of the infrastructure VLAN. An attacker could exploit this vulnerability by sending a crafted LLDP packet on the adjacent subnet to an affected device. A successful exploit could allow the attacker to connect an unauthorized server to the infrastructure VLAN, which is highly privileged. With a connection to the infrastructure VLAN, the attacker can make unauthorized connections to Cisco Application Policy Infrastructure Controller (APIC) services or join other host endpoints.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Application Policy Infrastructure Controller和Cisco Nexus 9000 Series Fabric Switches 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Application Policy Infrastructure Controller（APIC）和Cisco Nexus 9000 Series Fabric Switches都是美国思科（Cisco）公司的产品。Cisco Application Policy Infrastructure Controller是一款自动化的基础架构部署和治理解决方案。Cisco Nexus 9000 Series Fabric Switches是一款9000系列光纤交换机。 Cisco Nexus 90
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco NX-OS System Software in ACI Mode 11.0(1b) n/a -

II. Public POCs for CVE-2021-1228

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III. Intelligence Information for CVE-2021-1228

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Vendor Advisories for CVE-2021-1228 (1)

Same Patch Batch · Cisco · 2021-02-24 · 13 CVEs total

CVE-2021-1388 10.0 CRITICAL Cisco ACI Multi-Site Orchestrator Application Services Engine Deployment Authentication By
CVE-2021-1361 9.8 CRITICAL Cisco NX-OS Software Unauthenticated Arbitrary File Actions Vulnerability
CVE-2021-1393 9.8 CRITICAL Cisco Application Services Engine Unauthorized Access Vulnerabilities
CVE-2021-1396 9.8 CRITICAL Cisco Application Services Engine Unauthorized Access Vulnerabilities
CVE-2021-1368 8.8 HIGH Cisco FXOS and NX-OS Software Unidirectional Link Detection Denial of Service and Arbitrar
CVE-2021-1230 8.6 HIGH Cisco Nexus 9000 Series Fabric Switches ACI Mode BGP Route Installation Denial of Service
CVE-2021-1387 8.6 HIGH Cisco NX-OS Software IPv6 Netstack Denial of Service Vulnerability
CVE-2021-1229 5.8 MEDIUM Cisco NX-OS Software ICMP Version 6 Memory Leak Denial of Service Vulnerability
CVE-2021-1450 5.5 MEDIUM Cisco AnyConnect Secure Mobility Client Denial of Service Vulnerability
CVE-2021-1231 4.7 MEDIUM Cisco Nexus 9000 Series Fabric Switches ACI Mode Link Layer Discovery Protocol Port Denial
CVE-2021-1367 4.3 MEDIUM Cisco NX-OS Software Protocol Independent Multicast Denial of Service Vulnerability
CVE-2021-1227 Cisco NX-OS Software NX-API Cross-Site Request Forgery Vulnerability

IV. Related Vulnerabilities

Same vendor: Cisco
Same weakness: CWE-284

V. Comments for CVE-2021-1228

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