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CVE-2025-20340— Cisco IOS XR Address Resolution Protocol Broadcast Storm Vulnerability

Quick assessment

Affected
Cisco Cisco IOS XR 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 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。

CVSS 7.4 · High EPSS 0.61% · P47
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2025-20340

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Vendor Advisories for CVE-2025-20340 (1)

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

IV. Related Vulnerabilities

Same product: Cisco IOS XR Software
Same vendor: Cisco
Same weakness: CWE-400

V. Comments for CVE-2025-20340

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