CVE-2025-20189: A vulnerability in the Cisco Express Forwarding functionality of Cisco IOS XE Software for Cisco ASR 903 Aggregation Services Routers with Route...
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.
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.
Classification
CVE ID: CVE-2025-20189
CVSS Base Severity: HIGH
CVSS Base Score: 7.4
CVSS Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Problem Types
Mismatched Memory Management RoutinesAffected Products
Vendor: Cisco
Product: Cisco IOS XE Software
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.02% (probability of being exploited)
EPSS Percentile: 2.86% (scored less or equal to compared to others)
EPSS Date: 2025-06-03 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-20189https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asr903-rsp3-arp-dos-WmfzdvJZ