CVE-2023-20072 Cisco IOS XE Software Fragmented Tunnel Protocol Packet Denial of Service Vulnerability

High 8.6 Published 23 Mar 2023 Updated 28 Oct 2024

Remote attackers can cause Cisco IOS XE devices to reload by sending crafted fragmented tunnel protocol 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-2023-20072?

CVE-2023-20072 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 23 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the fragmentation handling code of tunnel protocol packets in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected system to reload, resulting in a denial of service (DoS) condition. This vulnerability is due to the improper handling of large fragmented tunnel protocol packets. One example of a tunnel protocol is Generic Routing Encapsulation (GRE). An attacker could exploit this vulnerability by sending crafted fragmented packets to an affected system. A successful exploit could allow the attacker to cause the affected system to reload, resulting in a DoS condition. Note: Only traffic directed to the affected system can be used to exploit this vulnerability.

Weakness: CWE-20

Which versions are affected by CVE-2023-20072?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2023-20072?

No fix has been published for CVE-2023-20072 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-2023-20072 being exploited?

There is no known exploitation of CVE-2023-20072 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-57j4-jv54-9h84.