CVE-2020-3531: Cisco IoT Field Network Director Unauthenticated REST API Vulnerability

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-11-18 · updated 2026-06-17
Weakness: CWE-306

Description

A vulnerability in the REST API of Cisco IoT Field Network Director (FND) could allow an unauthenticated, remote attacker to access the back-end database of an affected system. The vulnerability exists because the affected software does not properly authenticate REST API calls. An attacker could exploit this vulnerability by obtaining a cross-site request forgery (CSRF) token and then using the token with REST API requests. A successful exploit could allow the attacker to access the back-end database of the affected device and read, alter, or drop information.

Affected products

Cisco IoT Field Network Director (IoT-FND): before 4.6.1 — fixed in 4.6.1

How to fix

Upgrade to a fixed version: Cisco IoT Field Network Director (IoT-FND) 4.6.1. Check the vendor advisory for mitigations.

References

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