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

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-08-08 · updated 2026-06-17
Weakness: CWE-399

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.

Affected products

Cisco IoT Field Network Director (IoT-FND): before 4.4.2-11 — fixed in 4.4.2-11

How to fix

Upgrade to a fixed version: Cisco IoT Field Network Director (IoT-FND) 4.4.2-11. Check the vendor advisory for mitigations.

References

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