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CVE-2026-20171— Cisco Nexus 3000 and 9000 Series Border Gateway Protocol Denial of Service Vulnerability

Quick assessment

Affected
Cisco Cisco NX-OS Software
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 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存在安全漏洞，该漏洞源于错误解析传递BGP属性，可能导致未经身份验证的远程攻击者触发BGP对等体抖动并造成拒绝服务。

CVSS 6.8 · Medium EPSS 0.47% · P38

Possible ATT&CK Techniques 1 AI

T1498 · Network Denial of Service

Affected Version Matrix 49

VendorProduct Version RangeStatus
Cisco Cisco NX-OS Software 10.2(1) affected
10.2(1q) affected
10.2(2) affected
10.2(3) affected
10.2(3t) affected
10.2(2a) affected
10.3(1) affected
10.2(4) affected
… +41 more rows
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I. Basic Information for CVE-2026-20171

Vulnerability Information
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Vulnerability Title
Cisco Nexus 3000 and 9000 Series Border Gateway Protocol Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Border Gateway Protocol (BGP) enforce-first-as feature of Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, remote attacker to trigger BGP peer flaps, resulting in a denial of service (DoS) condition. This vulnerability is due to incorrect parsing of a transitive BGP attribute. An attacker could exploit this vulnerability by sending a crafted BGP update through an established BGP peer session. If the update propagates to an affected device, it could cause the device to drop the BGP session and flap with the BGP peer that is forwarding this update, resulting in a DoS condition.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
控制流实现总是不正确
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存在安全漏洞，该漏洞源于错误解析传递BGP属性，可能导致未经身份验证的远程攻击者触发BGP对等体抖动并造成拒绝服务。
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 10.2(1) -

II. Public POCs for CVE-2026-20171

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III. Intelligence Information for CVE-2026-20171

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Vendor Advisories for CVE-2026-20171 (1)

Same Patch Batch · Cisco · 2026-05-20 · 4 CVEs total

CVE-2026-20223 10.0 CRITICAL Cisco Secure Workload Unauthorized API Access Vulnerability
CVE-2026-20206 6.3 MEDIUM Cisco ThousandEyes BrowserBot Command Injection Vulnerability
CVE-2026-20199 4.7 MEDIUM Cisco ThousandEyes Virtual Appliance 注入漏洞

IV. Related Vulnerabilities

Same product: Cisco NX-OS Software
Same vendor: Cisco
Same weakness: CWE-670

V. Comments for CVE-2026-20171

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