CVE-2025-20189

HIGH
Published May 7, 2025 Modified Aug 5, 2025 CWE-762

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.

CVSS v3.1 Score

7.4
HIGH
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Weakness Type (CWE)

CWE-762 CWE-762

Affected Products

Vendor Product
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
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cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
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cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco ios_xe
cisco asr_903

References

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.4 (HIGH).
How severe is CVE-2025-20189? +
CVE-2025-20189 has a CVSS v3.1 score of 7.4 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
What products are affected by CVE-2025-20189? +
CVE-2025-20189 affects products from cisco, specifically: asr_903, ios_xe. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2025-20189? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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