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CVE-2025-20189

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
07/05/2025
Last modified:
05/08/2025

Description

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.<br /> <br /> 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.

Impact

Vector 3.x
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.40 HIGH
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Attack Vector (AV): Adjacent
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Changed
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
7.40
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:cisco:ios_xe:3.16.0cs:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16.0s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16.1as:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16.1s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16.2as:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16.2bs:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16.2s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16.3as:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16.3s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16.4as:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16.4bs:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16.4ds:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16.4s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16.5s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios_xe:3.16.6bs:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools