CVE-2019-1751 Cisco IOS Software NAT64 Denial of Service Vulnerability

High 8.6 Published 28 Mar 2019 Updated 19 Nov 2024

Remote unauthenticated attackers can cause a denial of service by sending specific IPv4 packets to devices running Cisco IOS with NAT64 enabled.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2019-1751?

CVE-2019-1751 is a high-severity denial of service vulnerability in Cisco Ios, published on 28 Mar 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the Network Address Translation 64 (NAT64) functions of Cisco IOS Software could allow an unauthenticated, remote attacker to cause either an interface queue wedge or a device reload. The vulnerability is due to the incorrect handling of certain IPv4 packet streams that are sent through the device. An attacker could exploit this vulnerability by sending specific IPv4 packet streams through the device. An exploit could allow the attacker to either cause an interface queue wedge or a device reload, resulting in a denial of service (DoS) condition.

Weakness: CWE-20

Which versions are affected by CVE-2019-1751?

It affects 1 product.

Products include Cisco Ios.

How do I fix CVE-2019-1751?

No fix has been published for CVE-2019-1751 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-1751 being exploited?

There is no known exploitation of CVE-2019-1751 in the wild and no public exploit code.

All Cisco Ios vulnerabilities

Sources

Also known as GHSA-cgx8-9m8p-2q4p.