CVE-2025-20340— Cisco IOS XR Address Resolution Protocol Broadcast Storm Vulnerability
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I. Basic Information for CVE-2025-20340
Vulnerability Information
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Vulnerability Title
Cisco IOS XR Address Resolution Protocol Broadcast Storm Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability in the Address Resolution Protocol (ARP) implementation of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to trigger a broadcast storm, leading to a denial of service (DoS) condition on an affected device. This vulnerability is due to how Cisco IOS XR Software processes a high, sustained rate of ARP traffic hitting the management interface. Under certain conditions, an attacker could exploit this vulnerability by sending an excessive amount of traffic to the management interface of an affected device, overwhelming its ARP processing capabilities. A successful exploit could result in degraded device performance, loss of management connectivity, and complete unresponsiveness of the system, leading to a DoS condition.
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
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Cisco IOS XR 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco IOS XR是美国思科（Cisco）公司的一套为其网络设备开发的操作系统。 Cisco IOS XR存在资源管理错误漏洞，该漏洞源于ARP实现处理不当，可能导致拒绝服务。
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 IOS XR Software | 6.5.3 | - |
II. Public POCs for CVE-2025-20340
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Cisco · 2025-09-10 · 3 CVEs total
| CVE-2025-20248 | 6.0 MEDIUM | Cisco IOS XR Software Image Verification Bypass Vulnerability |
| CVE-2025-20159 | 5.3 MEDIUM | Cisco IOS XR Software Management Interface ACL Bypass Vulnerability |
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Cisco IOS XR Software CLI Privilege Escalation Vulnerability - CVE-2025-20159
Cisco IOS XR Software Management Interface ACL Bypass Vulner
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V. Comments for CVE-2025-20340
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