CVE-2024-20321 Denial of service in Cisco NX-OS Software
Unauthenticated remote attackers can cause a denial of service by flooding eBGP traffic, dropping neighbor sessions on Cisco NX-OS 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-2024-20321?
CVE-2024-20321 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 in the External Border Gateway Protocol (eBGP) implementation of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability exists because eBGP traffic is mapped to a shared hardware rate-limiter queue. An attacker could exploit this vulnerability by sending large amounts of network traffic with certain characteristics through an affected device. A successful exploit could allow the attacker to cause eBGP neighbor sessions to be dropped, leading to a DoS condition in the network.
Which versions are affected by CVE-2024-20321?
It affects 1 product.
Products include Cisco Nx-Os.
How do I fix CVE-2024-20321?
No fix has been published for CVE-2024-20321 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-2024-20321 being exploited?
There is no known exploitation of CVE-2024-20321 in the wild and no public exploit code.
Other vulnerabilities in Cisco Nx-Os
Sources
Also known as GHSA-7rpf-cp7m-9q4f.