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CVE-2019-1977— Cisco Nexus 9000 Series Fabric Switches ACI Mode Border Leaf Endpoint Learning Vulnerability

Quick assessment

Affected
Cisco Cisco Nexus 9000 Series Fabric Switches in ACI
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 Nexus 9000 Series Switches是美国思科（Cisco）公司的一款9000系列交换机。NX-OS ACI Software是运行在其中一套使用在Cisco网络设备中的操作系统。 Cisco Nexus 9000 Series Switches（运行在Application Centric Infrastructure模式下）中的NX-OS ACI Software 12.2(4M)之前版本、13.1(2u)之前版本和13.2(1l)之前版本存在安全漏洞，该漏洞。远程攻击者可

AI Predicted 7.5 Difficulty: Easy EPSS 1.49% · P73
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I. Basic Information for CVE-2019-1977

Vulnerability Information
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Vulnerability Title
Cisco Nexus 9000 Series Fabric Switches ACI Mode Border Leaf Endpoint Learning Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability within the Endpoint Learning feature of Cisco Nexus 9000 Series Switches running in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an endpoint device in certain circumstances. The vulnerability is due to improper endpoint learning when packets are received on a specific port from outside the ACI fabric and destined to an endpoint located on a border leaf when Disable Remote Endpoint Learning has been enabled. This can result in a Remote (XR) entry being created for the impacted endpoint that will become stale if the endpoint migrates to a different port or leaf switch. This results in traffic not reaching the impacted endpoint until the Remote entry can be relearned by another mechanism.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
状态问题
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Nexus 9000 Series Switches NX-OS ACI Software 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Nexus 9000 Series Switches是美国思科（Cisco）公司的一款9000系列交换机。NX-OS ACI Software是运行在其中一套使用在Cisco网络设备中的操作系统。 Cisco Nexus 9000 Series Switches（运行在Application Centric Infrastructure模式下）中的NX-OS ACI Software 12.2(4M)之前版本、13.1(2u)之前版本和13.2(1l)之前版本存在安全漏洞，该漏洞。远程攻击者可
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 Nexus 9000 Series Fabric Switches in ACI unspecified ~ 12.2(4M) -

II. Public POCs for CVE-2019-1977

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III. Intelligence Information for CVE-2019-1977

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Vendor Advisories for CVE-2019-1977 (1)

Same Patch Batch · Cisco · 2019-08-29 · 5 CVEs total

CVE-2019-1967 Cisco NX-OS Software Network Time Protocol Denial of Service Vulnerability
CVE-2019-1966 Cisco Unified Computing System Fabric Interconnect root Privilege Escalation Vulnerability
CVE-2019-1969 Cisco NX-OS Software SNMP Access Control List Configuration Name Bypass Vulnerability
CVE-2019-1968 Cisco NX-OS Software NX-API Denial of Service Vulnerability

IV. Related Vulnerabilities

Same vendor: Cisco
Same weakness: CWE-371

V. Comments for CVE-2019-1977

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