CVE-2022-20870 Cisco IOS XE Software for Catalyst Switches MPLS Denial of Service Vulnerability

High 8.6 Published 10 Oct 2022 Updated 1 Nov 2024

Remote attackers can cause Cisco Catalyst switches to reload by sending malformed MPLS 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-2022-20870?

CVE-2022-20870 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 10 Oct 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the egress MPLS packet processing function of Cisco IOS XE Software for Cisco Catalyst 3650, Catalyst 3850, and Catalyst 9000 Family Switches could allow an unauthenticated, remote attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to insufficient input validation of IPv4 traffic. An attacker could exploit this vulnerability by sending a malformed packet out of an affected MPLS-enabled interface. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Weakness: CWE-130

Which versions are affected by CVE-2022-20870?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2022-20870?

No fix has been published for CVE-2022-20870 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-2022-20870 being exploited?

There is no known exploitation of CVE-2022-20870 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-prm7-p5hm-qq42.