Vulnerability in Cisco Asr 903
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (13.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 13.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Cisco Asr 903
- Cisco iOS Xe Software — versions 3.16.0S, 3.16.1S, 3.16.1aS
- Cisco iOS Xe — versions 3.16.0cs, 3.16.0s, 3.16.1as
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2025-20189?
- CVE-2025-20189 is a high-severity vulnerability in Cisco Asr 903, classified under CWE-762. CVSS score: 7.4/10. Published 2025-05-07.
- How severe is CVE-2025-20189?
- High severity. CVSS v3 base score is 7.4 out of 10.