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CVE-2022-20623— Cisco Nexus 9000 Series Switches Bidirectional Forwarding Detection Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco NX-OS Software
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco NX-OS Software是美国思科（Cisco）公司的一套交换机使用的数据中心级操作系统软件。 Cisco NX-OS Software for Cisco Nexus 9000 Series Switches存在安全漏洞，该漏洞源于BFD速率限制器功能中的逻辑错误。攻击者可利用该漏洞通过发送精心编制的流量流来导致拒绝服务（DoS）。

CVSS 8.6 · High EPSS 11.86% · P96

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2022-20623

Vulnerability Information
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Vulnerability Title
Cisco Nexus 9000 Series Switches Bidirectional Forwarding Detection Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the rate limiter for Bidirectional Forwarding Detection (BFD) traffic of Cisco NX-OS Software for Cisco Nexus 9000 Series Switches could allow an unauthenticated, remote attacker to cause BFD traffic to be dropped on an affected device. This vulnerability is due to a logic error in the BFD rate limiter functionality. An attacker could exploit this vulnerability by sending a crafted stream of traffic through the device. A successful exploit could allow the attacker to cause BFD traffic to be dropped, resulting in BFD session flaps. BFD session flaps can cause route instability and dropped traffic, resulting in a denial of service (DoS) condition. This vulnerability applies to both IPv4 and IPv6 traffic.
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
资源管理错误
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco NX-OS Software 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco NX-OS Software是美国思科（Cisco）公司的一套交换机使用的数据中心级操作系统软件。 Cisco NX-OS Software for Cisco Nexus 9000 Series Switches存在安全漏洞，该漏洞源于BFD速率限制器功能中的逻辑错误。攻击者可利用该漏洞通过发送精心编制的流量流来导致拒绝服务（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 Software n/a -

II. Public POCs for CVE-2022-20623

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III. Intelligence Information for CVE-2022-20623

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Vendor Advisories for CVE-2022-20623 (1)

Same Patch Batch · Cisco · 2022-02-23 · 4 CVEs total

CVE-2022-20650 8.8 HIGH Cisco NX-OS Software NX-API Command Injection Vulnerability
CVE-2022-20624 8.6 HIGH Cisco NX-OS Software Cisco Fabric Services Over IP Denial of Service Vulnerability
CVE-2022-20625 4.3 MEDIUM Cisco FXOS and NX-OS Software Cisco Discovery Protocol Service Denial of Service Vulnerabi

IV. Related Vulnerabilities

Same product: Cisco NX-OS Software
Same vendor: Cisco
Same weakness: CWE-399

V. Comments for CVE-2022-20623

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