CVE-2025-20262: Cisco NX-OS Software

Medium severity, CVSS 5.0. EPSS: 0.4% chance of exploitation in the next 30 days.

A vulnerability in the Protocol Independent Multicast Version 6 (PIM6) feature of Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an authenticated, low-privileged, remote attacker to trigger a crash of the PIM6 process, resulting in a denial of service (DoS) condition. This vulnerability is due to improper processing of PIM6 ephemeral data queries. An attacker could exploit this vulnerability by sending a crafted ephemeral query to an affected device through one of the following methods: NX-API REST, NETCONF, RESTConf, gRPC, or Model Driven Telemetry. A successful exploit could allow the attacker to cause the PIM6 process to crash and restart, causing potential adjacency flaps and resulting in a DoS of the PIM6 and ephemeral query processes.

Affected products

• Cisco Cisco NX-OS Software: version 9.2(3) only; version 9.2(2v) only; version 9.2(1) only; version 9.2(2t) only; version 9.2(3y) only; version 9.3(2) only; …

Published 2025-08-27. Last modified 2026-06-17.