CVE-2019-1718 Cisco Identity Services Engine SSL Renegotiation Denial of Service Vulnerability

Medium 5.3 Published 17 Apr 2019 Updated 19 Nov 2024

Unauthenticated remote attackers can cause denial of service in Cisco ISE by flooding SSL renegotiation requests, leading to high CPU usage.

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-2019-1718?

CVE-2019-1718 is a medium-severity denial of service vulnerability in Cisco Identity Services Engine, published on 17 Apr 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the web interface of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to trigger high CPU usage, resulting in a denial of service (DoS) condition. The vulnerability is due to improper handling of Secure Sockets Layer (SSL) renegotiation requests. An attacker could exploit this vulnerability by sending renegotiation requests at a high rate. An successful exploit could increase the resource usage on the system, eventually leading to a DoS condition. This vulnerability affects version 2.1.

Weakness: CWE-399

Which versions are affected by CVE-2019-1718?

It affects 1 product.

Products include Cisco Identity Services Engine.

How do I fix CVE-2019-1718?

No fix has been published for CVE-2019-1718 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-2019-1718 being exploited?

There is no known exploitation of CVE-2019-1718 in the wild and no public exploit code.

All Cisco Identity Services Engine vulnerabilities

Sources

Also known as GHSA-x3m5-7cfg-xfpq.