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CVE-2021-1586— Cisco Nexus 9000 Series Fabric Switches ACI Mode Multi-Pod and Multi-Site TCP Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco NX-OS System Software in ACI Mode
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 Fabric Switches是美国思科（Cisco）公司的一款9000系列光纤交换机。 Cisco Nexus 9000 Series Fabric Switches 存在数据伪造问题漏洞，该漏洞源于发送到受影响设备上特定端口的 TCP 流量未正确清理。该漏洞可能允许未经身份验证的远程攻击者意外重启设备，从而导致拒绝服务 (DoS)。

CVSS 8.6 · High EPSS 2.45% · P84
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I. Basic Information for CVE-2021-1586

Vulnerability Information
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Vulnerability Title
Cisco Nexus 9000 Series Fabric Switches ACI Mode Multi-Pod and Multi-Site TCP Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Multi-Pod or Multi-Site network configurations for Cisco Nexus 9000 Series Fabric Switches in Application Centric Infrastructure (ACI) mode could allow an unauthenticated, remote attacker to unexpectedly restart the device, resulting in a denial of service (DoS) condition. This vulnerability exists because TCP traffic sent to a specific port on an affected device is not properly sanitized. An attacker could exploit this vulnerability by sending crafted TCP data to a specific port that is listening on a public-facing IP address for the Multi-Pod or Multi-Site configuration. A successful exploit could allow the attacker to cause the device to restart unexpectedly, resulting in a DoS condition.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Nexus 9000 Series Fabric Switches 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Nexus 9000 Series Fabric Switches是美国思科（Cisco）公司的一款9000系列光纤交换机。 Cisco Nexus 9000 Series Fabric Switches 存在数据伪造问题漏洞，该漏洞源于发送到受影响设备上特定端口的 TCP 流量未正确清理。该漏洞可能允许未经身份验证的远程攻击者意外重启设备，从而导致拒绝服务 (DoS)。
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 n/a -

II. Public POCs for CVE-2021-1586

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III. Intelligence Information for CVE-2021-1586

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Vendor Advisories for CVE-2021-1586 (1)

Same Patch Batch · Cisco · 2021-08-25 · 15 CVEs total

CVE-2021-1577 9.1 CRITICAL Cisco Application Policy Infrastructure Controller Arbitrary File Read and Write Vulnerabi
CVE-2021-1578 8.8 HIGH Cisco Application Policy Infrastructure Controller Privilege Escalation Vulnerability
CVE-2021-1588 8.6 HIGH Cisco NX-OS Software MPLS OAM Denial of Service Vulnerability
CVE-2021-1587 8.6 HIGH Cisco NX-OS Software VXLAN OAM (NGOAM) Denial of Service Vulnerability
CVE-2021-1523 8.6 HIGH Cisco Nexus 9000 Series Fabric Switches ACI Mode Queue Wedge Denial of Service Vulnerabili
CVE-2021-1579 8.1 HIGH Cisco Application Policy Infrastructure Controller App Privilege Escalation Vulnerability
CVE-2021-1581 6.5 MEDIUM Cisco Application Policy Infrastructure Controller Command Injection and File Upload Vulne
CVE-2021-1580 6.5 MEDIUM Cisco Application Policy Infrastructure Controller Command Injection and File Upload Vulne
CVE-2021-1584 6.0 MEDIUM Cisco Nexus 9000 Series Fabric Switches ACI Mode Privilege Escalation Vulnerability
CVE-2021-1591 5.8 MEDIUM Cisco Nexus 9500 Series Switches Access Control List Bypass Vulnerability
CVE-2021-1582 5.4 MEDIUM Cisco Application Policy Infrastructure Controller Stored Cross-Site Scripting Vulnerabili
CVE-2021-1590 5.3 MEDIUM Cisco NX-OS Software system login block-for Denial of Service Vulnerability
CVE-2021-1583 4.4 MEDIUM Cisco Nexus 9000 Series Fabric Switches ACI Mode Arbitrary File Read Vulnerability
CVE-2021-1592 4.3 MEDIUM Cisco UCS Manager Software SSH Sessions Denial of Service Vulnerability

IV. Related Vulnerabilities

Same product: Cisco NX-OS System Software in ACI Mode
Same vendor: Cisco
Same weakness: CWE-345

V. Comments for CVE-2021-1586

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