CVE-2022-20915 Cisco IOS XE Software IPv6 VPN over MPLS Denial of Service Vulnerability

High 7.4 Published 10 Oct 2022 Updated 1 Nov 2024

An unauthenticated adjacent attacker can cause a device reload and denial of service by sending crafted IPv6 packets in a specific 6VPE and ZBFW configuration.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2022-20915?

CVE-2022-20915 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 10 Oct 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability in the implementation of IPv6 VPN over MPLS (6VPE) with Zone-Based Firewall (ZBFW) of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper error handling of an IPv6 packet that is forwarded from an MPLS and ZBFW-enabled interface in a 6VPE deployment. An attacker could exploit this vulnerability by sending a crafted IPv6 packet sourced from a device on the IPv6-enabled virtual routing and forwarding (VRF) interface through the affected device. A successful exploit could allow the attacker to reload the device, resulting in a DoS condition.

Weakness: CWE-436, CWE-115

Which versions are affected by CVE-2022-20915?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2022-20915?

No fix has been published for CVE-2022-20915 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-2022-20915 being exploited?

There is no known exploitation of CVE-2022-20915 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-xx9r-h2q8-q5m3.