CVE-2020-3162: Cisco IoT Field Network Director Denial of Service Vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-04-15 · updated 2026-06-17
Weakness: CWE-20

Description

A vulnerability in the Constrained Application Protocol (CoAP) implementation of Cisco IoT Field Network Director could allow an unauthenticated remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient input validation of incoming CoAP traffic. An attacker could exploit this vulnerability by sending a malformed CoAP packet to an affected device. A successful exploit could allow the attacker to force the CoAP server to stop, interrupting communication to the IoT endpoints.

Affected products

Cisco IoT Field Network Director (IoT-FND): before 4.6.0 — fixed in 4.6.0

How to fix

Upgrade to a fixed version: Cisco IoT Field Network Director (IoT-FND) 4.6.0. Check the vendor advisory for mitigations.

References

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