CVE-2019-1964

Cisco NX-OS Software IPv6 Denial of Service Vulnerability

HIGH

8.6

CVSS Score

Published: August 28, 2019 at 06:55 PM UTC

Updated: June 17, 2026 at 02:29 AM UTC

29 products affected across 1 vendorNx OSNexus 7700 Supervisor 3ENexus 7000 Supervisor 2E

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Severity

HIGH8.6

Exploit prediction

EPSS 2%

SSVC

No known exploit

Description

A vulnerability in the IPv6 traffic processing of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause an unexpected restart of the netstack process on an affected device. The vulnerability is due to improper validation of IPv6 traffic sent through an affected device. An attacker could exploit this vulnerability by sending a malformed IPv6 packet through an affected device. A successful exploit could allow the attacker to cause a denial of service (DoS) condition while the netstack process restarts. A sustained attack could lead to a reboot of the device.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nx OS · Cisconpm

95%

v < 8.4(1)8.1 ≤ v < 8.2(3)8.3 ≤ v < 8.4

Affected range stops below 8.2(3), so it looks safe — our inference, not a vendor statement

Affected range stops below 8.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 8.4(1), so it looks safe — our inference, not a vendor statement

cisco-7000-10-slot (environment) · cisco-7000-18-slot (environment) · cisco-7000-4-slot (environment) · cisco-7000-9-slot (environment) · cisco-7700-10-slot (environment) · cisco-7700-18-slot (environment) · cisco-7700-2-slot (environment) · cisco-7700-6-slot (environment) · cisco-n77-f312ck-26 (environment) · cisco-n77-f324fq-25 (environment) · cisco-n77-f348xp-23 (environment) · cisco-n77-f430cq-36 (environment) · cisco-n77-m312cq-26l (environment) · cisco-n77-m324fq-25l (environment) · cisco-n77-m348xp-23l (environment) · cisco-n7k-f248xp-25e (environment) · cisco-n7k-f306ck-25 (environment) · cisco-n7k-f312fq-25 (environment) · cisco-n7k-m202cf-22l (environment) · cisco-n7k-m206fq-23l (environment) · cisco-n7k-m224xp-23l (environment) · cisco-n7k-m324fq-25l (environment) · cisco-n7k-m348xp-25l (environment) · cisco-nexus-7000-supervisor-1 (environment) · cisco-nexus-7000-supervisor-2 (environment) · cisco-nexus-7000-supervisor-2e (environment) · cisco-nexus-7700-supervisor-2e (environment) · cisco-nexus-7700-supervisor-3e (environment)

7000 10-Slot · Ciscodevice

80%

All versions

7000 18-Slot · Ciscodevice

80%

All versions

7000 4-Slot · Ciscodevice

80%

All versions

7000 9-Slot · Ciscodevice

80%

All versions