Detections
Analytics
Cisco IOS XR ARP Broadcast Storm Denial of Service (cisco-sa-iosxr-arp-storm-EjUU55yM)
high Nessus Plugin ID 266223
Language:
Synopsis
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.Description
According to its self-reported version, Cisco IOS XR is affected by a vulnerability.- 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.
Please see the included Cisco BIDs and Cisco Security Advisory for more information.
Solution
Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwm86399See Also
Plugin Details
Severity: High
ID: 266223
File Name: cisco-sa-iosxr-arp-storm-EjUU55yM-iosxr.nasl
Version: 1.1
Type: combined
Family: CISCO
Published: 9/30/2025
Updated: 9/30/2025
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 5.2
CVSS v2
Risk Factor: Medium
Base Score: 6.1
Vector: CVSS2#AV:A/AC:L/Au:N/C:N/I:N/A:C
CVSS Score Source: CVE-2025-20340
CVSS v3
Risk Factor: High
Base Score: 7.4
Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Vulnerability Information
CPE: cpe:/o:cisco:ios_xr
Required KB Items: Host/Cisco/IOS-XR/Version
Exploit Ease: No known exploits are available
Patch Publication Date: 9/10/2025
Vulnerability Publication Date: 9/10/2025
Reference Information
CVE: CVE-2025-20340