CVE-2025-20154: Cisco IOS

High severity, CVSS 8.6. EPSS: 0.5% chance of exploitation in the next 30 days.

A vulnerability in the Two-Way Active Measurement Protocol (TWAMP) server feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition. For Cisco IOS XR Software, this vulnerability could cause the ipsla_ippm_server process to reload unexpectedly if debugs are enabled. This vulnerability is due to out-of-bounds array access when processing specially crafted TWAMP control packets. An attacker could exploit this vulnerability by sending crafted TWAMP control packets to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: For Cisco IOS XR Software, only the ipsla_ippm_server process reloads unexpectedly and only when debugs are enabled. The vulnerability details for Cisco IOS XR Software are as follows:    Security Impact Rating (SIR): Low    CVSS Base Score: 3.7    CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Affected products

• Cisco IOS: up to and including 15.9\(3\)m11
• Cisco IOS XE: from 16.6.1, up to and including 17.2.3
• Cisco IOS XR: version 6.5.1 only; version 6.5.2 only; version 6.5.3 only; version 6.5.15 only; version 6.5.25 only; version 6.5.26 only; …

Published 2025-05-07. Last modified 2026-06-17.