CVE-2018-0170 Use after free in Cisco IOS XE

High 7.5 Published 28 Mar 2018 Updated 2 Dec 2024

An unauthenticated remote attacker can cause a denial of service on Cisco IOS XE devices by sending malformed packets that trigger a use-after-free error.

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-2018-0170?

CVE-2018-0170 is a high-severity use after free vulnerability in Cisco Ios Xe, published on 28 Mar 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the Cisco Umbrella Integration feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition, related to the OpenDNS software. The vulnerability is due to a logic error that exists when handling a malformed incoming packet, leading to access to an internal data structure after it has been freed. An attacker could exploit this vulnerability by sending crafted, malformed IP packets to an affected device. A successful exploit could allow the attacker to cause an affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvb86327.

Weakness: CWE-416

Which versions are affected by CVE-2018-0170?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2018-0170?

No fix has been published for CVE-2018-0170 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2018-0170 being exploited?

There is no known exploitation of CVE-2018-0170 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-h5j7-h5xp-7395.