CVE-2019-1617: Cisco Nexus 9000 Series Switches Standalone NX-OS Mode Fibre Channel over Ethernet NPV Denial of Service Vulnerability

Severity: high (CVSS 7.4 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-03-11 · updated 2026-06-17
Weakness: CWE-913

Description

A vulnerability in the Fibre Channel over Ethernet (FCoE) N-port Virtualization (NPV) protocol implementation in Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition. The vulnerability is due to an incorrect processing of FCoE packets when the fcoe-npv feature is uninstalled. An attacker could exploit this vulnerability by sending a stream of FCoE frames from an adjacent host to an affected device. An exploit could allow the attacker to cause packet amplification to occur, resulting in the saturation of interfaces and a DoS condition. Nexus 9000 Series Switches in Standalone NX-OS Mode are affected running software versions prior to 7.0(3)I7(5) and 9.2(2).

Affected products

Cisco NX-OS: from 9.2 before 9.2\(2\); from 7.0\(3\)i5 before 7.0\(3\)i7\(5\) — fixed in 7.0\(3\)i7\(5\), 9.2\(2\)

How to fix

Upgrade to a fixed version: Cisco NX-OS 7.0\(3\)i7\(5\), 9.2\(2\). Check the vendor advisory for mitigations.

References

Get alerted when CVE-2019-1617 or the next vulnerability affects your stack