CVE-2019-1957 Cisco IoT Field Network Director TLS Renegotiation Denial of Service Vulnerability

Medium 5.3 Published 8 Aug 2019 Updated 19 Nov 2024

Unauthenticated remote attackers can cause denial of service on Cisco IoT Field Network Director by flooding TLS renegotiation requests.

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-2019-1957?

CVE-2019-1957 is a medium-severity denial of service vulnerability in Cisco IoT Field Network Director (IoT-FND), published on 8 Aug 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 IoT Field Network Director could allow an unauthenticated, remote attacker to trigger high CPU usage, resulting in a denial of service (DoS) condition on an affected device. The vulnerability is due to improper handling of Transport Layer Security (TLS) renegotiation requests. An attacker could exploit this vulnerability by sending renegotiation requests at a high rate. A successful exploit could increase the resource usage on the system, eventually leading to a DoS condition.

Weakness: CWE-399

Which versions are affected by CVE-2019-1957?

It affects 1 product.

Products include Cisco Iot Field Network Director.

How do I fix CVE-2019-1957?

No fix has been published for CVE-2019-1957 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-2019-1957 being exploited?

There is no known exploitation of CVE-2019-1957 in the wild and no public exploit code.

Sources

Also known as GHSA-rmxg-r6q3-64j3.