What is CVE-2020-3392?

CVE-2020-3392 is a high-severity vulnerability in Cisco Iot Field Network Director (Iot-Fnd), classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2020-11-18.

How severe is CVE-2020-3392?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Cisco Iot Field Network Director (Iot-Fnd)

CVE-2020-3392

A vulnerability in the API of Cisco IoT Field Network Director (FND) could allow an unauthenticated, remote attacker to view sensitive information on an affected system. The vulnerability exists because the affected software does not properly authenticate API calls. An attacker could exploit this vulnerability by sending API requests to an affected system. A successful exploit could allow the attacker to view sensitive information on the affected system, including information about the devices that the system manages, without authentication.

Vulnerability class: Broken Authentication

Published 2020-11-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.015 (74.6th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 74.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-FND-APIA… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2020-3392?: CVE-2020-3392 is a high-severity vulnerability in Cisco Iot Field Network Director (Iot-Fnd), classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2020-11-18.
How severe is CVE-2020-3392?: High severity. CVSS v3 base score is 7.5 out of 10.