CVE-2019-12657 Cisco IOS XE Software Unified Threat Defense Denial of Service Vulnerability

High 8.6 Published 25 Sep 2019 Updated 19 Nov 2024

Remote attackers can cause a denial of service on Cisco IOS XE devices by sending malicious IPv6 traffic to devices with Unified Threat Defense 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-2019-12657?

CVE-2019-12657 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 Unified Threat Defense (UTD) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to improper validation of IPv6 packets through the UTD feature. An attacker could exploit this vulnerability by sending IPv6 traffic through an affected device that is configured with UTD. A successful exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition.

Weakness: CWE-20

Which versions are affected by CVE-2019-12657?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2019-12657?

No fix has been published for CVE-2019-12657 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-2019-12657 being exploited?

There is no known exploitation of CVE-2019-12657 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-wq5w-p696-g7gx.