CVE-2024-20267 Denial of service in Cisco NX-OS Software
An unauthenticated remote attacker can cause a denial of service on Cisco NX-OS devices by sending crafted MPLS-encapsulated IPv6 packets to enabled interfaces.
- 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-2024-20267?
CVE-2024-20267 is a high-severity denial of service vulnerability in Cisco Nx-Os, published on 28 Feb 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability with the handling of MPLS traffic for Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause the netstack process to unexpectedly restart, which could cause the device to stop processing network traffic or to reload. This vulnerability is due to lack of proper error checking when processing an ingress MPLS frame. An attacker could exploit this vulnerability by sending a crafted IPv6 packet that is encapsulated within an MPLS frame to an MPLS-enabled interface of the targeted device. A successful exploit could allow the attacker to cause a denial of service (DoS) condition. Note: The IPv6 packet can be generated multiple hops away from the targeted device and then encapsulated within MPLS. The DoS condition may occur when the NX-OS device processes the packet.
Weakness: CWE-120
Which versions are affected by CVE-2024-20267?
It affects 1 product.
Products include Cisco Nx-Os.
How do I fix CVE-2024-20267?
No fix has been published for CVE-2024-20267 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-2024-20267 being exploited?
There is no known exploitation of CVE-2024-20267 in the wild and no public exploit code.
Other vulnerabilities in Cisco Nx-Os
Sources
Also known as GHSA-r2c7-g2vh-f84m.