CVE-2019-12646 Cisco IOS XE Software NAT Session Initiation Protocol Application Layer Gateway Denial of Service Vulnerability

High 8.6 Published 25 Sep 2019 Updated 19 Nov 2024

Remote attackers can cause Cisco IOS XE devices to reload by sending crafted SIP packets, resulting in a denial of service.

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-2019-12646?

CVE-2019-12646 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 25 Sep 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 (NAT) Session Initiation Protocol (SIP) Application Layer Gateway (ALG) of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to improper processing of transient SIP packets on which NAT is performed on an affected device. An attacker could exploit this vulnerability by using UDP port 5060 to send crafted SIP packets through an affected device that is performing NAT for SIP packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a denial of service (DoS) condition.

Weakness: CWE-665, CWE-399

Which versions are affected by CVE-2019-12646?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2019-12646?

No fix has been published for CVE-2019-12646 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-2019-12646 being exploited?

There is no known exploitation of CVE-2019-12646 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-j86j-prqg-7fpq.