CVE-2026-20010— Cisco Nexus 3000 and 9000 Series Switches Link Layer Discovery Protocol Denial of Service Vulnerability
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I. Basic Information for CVE-2026-20010
Vulnerability Information
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Vulnerability Title
Cisco Nexus 3000 and 9000 Series Switches Link Layer Discovery Protocol Denial of Service Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability in the Link Layer Discovery Protocol (LLDP) feature of Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause the LLDP process to restart, which could cause an affected device to reload unexpectedly. This vulnerability is due to improper handling of specific fields in an LLDP frame. An attacker could exploit this vulnerability by sending a crafted LLDP packet to an interface of an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition. Note: LLDP is a Layer 2 link protocol. To exploit this vulnerability, an attacker would need to be directly connected to an interface of an affected device, either physically or logically (for example, through a Layer 2 Tunnel configured to transport the LLDP protocol).
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用不正确的长度值访问缓冲区
Source: NVD (National Vulnerability Database)
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，该漏洞源于对LLDP帧中特定字段处理不当，可能导致设备意外重新加载，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 | 10.3(1) | - | |
| Cisco | Cisco NX-OS System Software in ACI Mode | 16.0(2h) | - | |
| Cisco | Cisco Unified Computing System (Managed) | 4.3(4e) | - |
II. Public POCs for CVE-2026-20010
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|---|
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Same Patch Batch · Cisco · 2026-02-25 · 15 CVEs total
| CVE-2026-20127 | 10.0 CRITICAL | Cisco Catalyst SD-WAN Controller Authentication Bypass Vulnerability |
| CVE-2026-20129 | 9.8 CRITICAL | Cisco Catayst SD-WAN Authentication Bypass Vulnerability |
| CVE-2026-20126 | 8.8 HIGH | Cisco Catalyst SD-WAN Manager Privilege Escalation Vulnerability |
| CVE-2026-20048 | 7.7 HIGH | Cisco NX-OS Software SNMP Denial of Service Vulnerability |
| CVE-2026-20128 | 7.5 HIGH | Cisco Catalyst SD-WAN Manager Information Disclosure Vulnerability |
| CVE-2026-20033 | 7.4 HIGH | Cisco NX-OS Software Denial of Service Vulnerability |
| CVE-2026-20051 | 7.4 HIGH | Cisco Nexus 3600-R and 9500-R Series Switching Platforms Layer 2 Loop Denial of Service Vu |
| CVE-2026-20099 | 6.7 MEDIUM | Cisco UCS Manager and FXOS Software Command Injection Vulnerability |
| CVE-2026-20036 | 6.5 MEDIUM | Cisco UCS Manager Software Command Injection Vulnerability |
| 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 Denial of Service Vulnerability |
| CVE-2026-20122 | 5.4 MEDIUM | Cisco Catalyst SD-WAN Manager Arbitrary File Overwrite Vulnerability |
| CVE-2026-20091 | 4.8 MEDIUM | Cisco UCS Manager and FXOS Software Stored Cross-Site Scripting Vulnerability |
| CVE-2026-20037 | 4.4 MEDIUM | Cisco UCS Manager File Write Vulnerability |
IV. Related Vulnerabilities
Same product: Cisco NX-OS Software
- CVE-2026-20051
Cisco Nexus 3600-R and 9500-R Series Switching Platforms Lay - CVE-2025-20241
Cisco Nexus 3000 and 9000 Series Switches IS-IS Protocol <TB - CVE-2025-20262
Cisco Nexus 3000 and 9000 Series Switches Protocol Independe - CVE-2025-20290
Cisco NXOS Software Sensitive Log Information Disclosure Vul - CVE-2025-20292
Cisco NXOS Software Command Injection Vulnerability
Same vendor: Cisco
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Cisco Unity Connection Server-Side Request Forgery Vulnerabi - CVE-2026-20167
Cisco IoT Field Network Director Remote Device Denial of Ser - CVE-2026-20169
Cisco IoT Field Network Director Command Injection Vulnerabi
Same weakness: CWE-805
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Xorg: xwayland: x.org x server: information disclosure or de - CVE-2026-6245
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V. Comments for CVE-2026-20010
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