CVE-2020-3338 Cisco NX-OS Software IPv6 Protocol Independent Multicast Denial of Service Vulnerability
Remote attackers can cause a denial of service on Cisco NX-OS devices by sending crafted IPv6 PIM packets that trigger a memory leak.
- 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-2020-3338?
CVE-2020-3338 is a high-severity denial of service vulnerability in Cisco Nx-Os, published on 27 Aug 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the Protocol Independent Multicast (PIM) feature for IPv6 networks (PIM6) of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper error handling when processing inbound PIM6 packets. An attacker could exploit this vulnerability by sending multiple crafted PIM6 packets to an affected device. A successful exploit could allow the attacker to cause the PIM6 application to leak system memory. Over time, this memory leak could cause the PIM6 application to stop processing legitimate PIM6 traffic, leading to a DoS condition on the affected device.
Which versions are affected by CVE-2020-3338?
It affects 1 product.
Products include Cisco Nx-Os.
How do I fix CVE-2020-3338?
No fix has been published for CVE-2020-3338 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-2020-3338 being exploited?
There is no known exploitation of CVE-2020-3338 in the wild and no public exploit code.
Other vulnerabilities in Cisco Nx-Os
Sources
Also known as GHSA-h3fx-mx5w-cwrx.