CVE-2018-0421 Cisco Prime Access Registrar Denial of Service Vulnerability
Unauthenticated remote attackers can cause a denial of service by sending crafted TCP SYN packets, leading to resource exhaustion and application restarts.
- 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-2018-0421?
CVE-2018-0421 is a high-severity denial of service vulnerability in Cisco Prime Access Registrar, published on 5 Oct 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in TCP connection management in Cisco Prime Access Registrar could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition when the application unexpectedly restarts. The vulnerability is due to incorrect handling of incoming TCP SYN packets to specific listening ports. The improper handling of the TCP SYN packets could cause a system file description to be allocated and not freed. An attacker could exploit this vulnerability by sending a crafted stream of TCP SYN packets to the application. A successful exploit could allow the attacker to cause the application to eventually restart if a file description cannot be obtained.
Which versions are affected by CVE-2018-0421?
It affects 2 products.
Products include Cisco Prime Access Registrar, Cisco Prime Access Registrar Jumpstart.
How do I fix CVE-2018-0421?
No fix has been published for CVE-2018-0421 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-2018-0421 being exploited?
There is no known exploitation of CVE-2018-0421 in the wild and no public exploit code.
Other vulnerabilities in Cisco Prime Access Registrar
Sources
Also known as GHSA-3vp8-x92w-r8qp.