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 Switch Processor 3 (RSP3C) could allow an unauthenticat
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.
Weakness: CWE-762
Affected products
| Vendor | Product | Category | Matched by |
|---|---|---|---|
| Cisco | Cisco IOS XE Software | Routing & Switching | cna-assigner |
Vendor-reported products (1)
- Cisco · Cisco IOS XE Software
Vendor advisory
cisco-sa-asr903-rsp3-arp-dos-WmfzdvJZ
Cisco IOS XE Software for Cisco ASR 903 Aggregation Services Routers ARP Denial of Service Vulnerability
Cisco’s rating: High (advisory CVSS 7.4) · Published May 7, 2025
Bug ID: CSCwh55442
The vendor’s rating applies to the whole advisory and can differ from this CVE’s own CVSS severity. Where this comes from