CVE-2023-20080 Cisco IOS and IOS XE Software IPv6 DHCP (DHCPv6) Relay and Server Denial of Service Vulnerability

High 8.6 Published 23 Mar 2023 Updated 28 Oct 2024

Remote attackers can cause unexpected device reloads by sending crafted DHCPv6 messages to Cisco IOS devices.

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-2023-20080?

CVE-2023-20080 is a high-severity denial of service vulnerability in Cisco Ios, 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 IPv6 DHCP version 6 (DHCPv6) relay and server features of Cisco IOS and IOS XE Software could allow an unauthenticated, remote attacker to trigger a denial of service (DoS) condition. This vulnerability is due to insufficient validation of data boundaries. An attacker could exploit this vulnerability by sending crafted DHCPv6 messages to an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly.

Weakness: CWE-129

Which versions are affected by CVE-2023-20080?

It affects 2 products.

Products include Cisco Ios, Cisco Ios Xe.

How do I fix CVE-2023-20080?

No fix has been published for CVE-2023-20080 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-2023-20080 being exploited?

There is no known exploitation of CVE-2023-20080 in the wild and no public exploit code.

All Cisco Ios vulnerabilities

Sources

Also known as GHSA-m5h2-j2j6-cwcw.