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Cisco IOS XE Software for ASR 903 Aggregation Services Routers ARP DoS (cisco-sa-asr903-rsp3-arp-dos-WmfzdvJZ)

high Nessus Plugin ID 325381

Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco IOS-XE Software is affected by a vulnerability.

 - A vulnerability in the Cisco Express Forwarding functionality of Cisco IOS XE Software for Cisco ASR 903 Aggregation Services Routers with Route Switch Processor 3 (RSP3C) could allow an unauthenticated, adjacent attacker to trigger a denial of service (DoS) condition. This vulnerability is due to improper memory management when Cisco IOS XE Software is processing Address Resolution Protocol (ARP) messages. An attacker could exploit this vulnerability by sending crafted ARP messages at a high rate over a period of time to an affected device. A successful exploit could allow the attacker to exhaust system resources, which eventually triggers a reload of the active route switch processor (RSP). If a redundant RSP is not present, the router reloads. (CVE-2025-20189)

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 CSCwh55442

See Also

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwh55442

http://www.nessus.org/u?564dd2a1

http://www.nessus.org/u?572c13fe

Plugin Details

Severity: High

ID: 325381

File Name: cisco-sa-asr903-rsp3-arp-dos-WmfzdvJZ-iosxe.nasl

Version: 1.1

Type: Combined

Family: CISCO

Published: 7/7/2026

Updated: 7/7/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.3

Percentile: 96.95

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

Vector: CVSS2#AV:A/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2025-20189

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:ios_xe

Required KB Items: Settings/ParanoidReport, Host/Cisco/IOS-XE/Version, Host/Cisco/IOS-XE/Model

Exploit Ease: No known exploits are available

Patch Publication Date: 5/7/2025

Vulnerability Publication Date: 5/7/2025

Reference Information

CVE: CVE-2025-20189

CWE: 762

CISCO-SA: cisco-sa-asr903-rsp3-arp-dos-WmfzdvJZ

IAVA: 2025-A-0318

CISCO-BUG-ID: CSCwh55442