CVE-2026-20051— Cisco Nexus 3600 Platform Switches和Cisco Nexus 9500 Series Switches 安全漏洞
可能的 ATT&CK 技术 1AI
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一、 漏洞 CVE-2026-20051 基础信息
漏洞信息
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Vulnerability Title
Cisco Nexus 3600-R and 9500-R Series Switching Platforms Layer 2 Loop Denial of Service Vulnerability
来源: 美国国家漏洞数据库 NVD
Vulnerability Description
A vulnerability with the Ethernet VPN (EVPN) Layer 2 ingress packet processing of Cisco Nexus 3600 Platform Switches and Cisco Nexus 9500-R Series Switching Platforms could allow an unauthenticated, adjacent attacker to trigger a Layer 2 traffic loop. This vulnerability is due to a logic error when processing a crafted Layer 2 ingress frame. An attacker could exploit this vulnerability by sending a stream of crafted Ethernet frames through the targeted device. A successful exploit could allow the attacker to cause a Layer 2 Virtual eXtensible LAN (VxLAN) traffic loop, which, in turn, could result in a denial of service (DoS) condition. This Layer 2 loop could oversubscribe the bandwidth on network interfaces, which would result in all data plane traffic being dropped. To exploit this vulnerability, the attacker must be Layer 2-adjacent to the affected device. Note: To stop active exploitation of this vulnerability, manual intervention is required to both stop the crafted traffic and flap all involved network interfaces. For additional assistance if a Layer 2 loop that is related to this vulnerability is suspected, contact the Cisco Technical Assistance Center (TAC) or the proper support provider.
来源: 美国国家漏洞数据库 NVD
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
来源: 美国国家漏洞数据库 NVD
Vulnerability Type
使用未经初始化的变量
来源: 美国国家漏洞数据库 NVD
Vulnerability Title
Cisco Nexus 3600 Platform Switches和Cisco Nexus 9500 Series Switches 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Cisco Nexus 3600 Platform Switches和Cisco Nexus 9500 Series Switches都是美国思科（Cisco）公司的产品。Cisco Nexus 3600 Platform Switches是一款3600系列平台交换机。Cisco Nexus 9500 Series Switches是系列交换机。 Cisco Nexus 3600 Platform Switches和Cisco Nexus 9500 Series Switches存在安全漏洞，该漏洞源于处
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| Cisco | Cisco NX-OS Software | 9.2(3) | - |
二、漏洞 CVE-2026-20051 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-20051 厂商安全公告 (1)
同批安全公告 · Cisco · 2026-02-25 · 共 15 条
| CVE-2026-20127 | 10.0 CRITICAL | Cisco Catalyst SD-WAN Manager和Cisco Catalyst SD-WAN Controller 授权问题漏洞 |
| CVE-2026-20129 | 9.8 CRITICAL | Cisco Catalyst SD-WAN Manager（Cisco SD-WAN vManage） 授权问题漏洞 |
| CVE-2026-20126 | 8.8 HIGH | Cisco Catalyst SD-WAN Manager 安全漏洞 |
| CVE-2026-20048 | 7.7 HIGH | Cisco Nexus 9000 Series Fabric Switches 安全漏洞 |
| CVE-2026-20128 | 7.5 HIGH | Cisco Catalyst SD-WAN Manager（Cisco SD-WAN vManage） 安全漏洞 |
| CVE-2026-20033 | 7.4 HIGH | Cisco Nexus 9000 Series Fabric Switches 安全漏洞 |
| CVE-2026-20010 | 7.4 HIGH | Cisco NX-OS Software 安全漏洞 |
| CVE-2026-20099 | 6.7 MEDIUM | Cisco FXOS Software和Cisco UCS Manager Software 操作系统命令注入漏洞 |
| CVE-2026-20036 | 6.5 MEDIUM | Cisco UCS Manager Software 操作系统命令注入漏洞 |
| CVE-2026-20133 | 6.5 MEDIUM | Cisco Catalyst SD-WAN Manager（Cisco SD-WAN vManage） 信息泄露漏洞 |
| CVE-2026-20107 | 5.5 MEDIUM | Cisco Application Policy Infrastructure Controller 安全漏洞 |
| CVE-2026-20122 | 5.4 MEDIUM | Cisco Catalyst SD-WAN Manager 安全漏洞 |
| CVE-2026-20091 | 4.8 MEDIUM | Cisco FXOS Software和Cisco UCS Manager Software 跨站脚本漏洞 |
| CVE-2026-20037 | 4.4 MEDIUM | Cisco UCS Manager Software 安全漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-20051
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