CVE-2019-16027 Cisco IOS XR Software Intermediate System–to–Intermediate System Denial of Service Vulnerability

High 7.7 Published 26 Jan 2020 Updated 15 Nov 2024

An authenticated remote attacker can cause a denial of service in the IS-IS process by sending a crafted SNMP request to Cisco IOS XR devices.

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

What is CVE-2019-16027?

CVE-2019-16027 is a high-severity denial of service vulnerability in Cisco Ios Xr, published on 26 Jan 2020. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability in the implementation of the Intermediate System–to–Intermediate System (IS–IS) routing protocol functionality in Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the IS–IS process. The vulnerability is due to improper handling of a Simple Network Management Protocol (SNMP) request for specific Object Identifiers (OIDs) by the IS–IS process. An attacker could exploit this vulnerability by sending a crafted SNMP request to the affected device. A successful exploit could allow the attacker to cause a DoS condition in the IS–IS process.

Weakness: CWE-20

Which versions are affected by CVE-2019-16027?

It affects 1 product.

Products include Cisco Ios Xr.

How do I fix CVE-2019-16027?

No fix has been published for CVE-2019-16027 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-2019-16027 being exploited?

There is no known exploitation of CVE-2019-16027 in the wild and no public exploit code.

All Cisco Ios Xr vulnerabilities

Sources

Also known as GHSA-69gf-2w85-7g9q.