CVE-2026-20167: Cisco IoT Field Network Director

High severity, CVSS 7.7. EPSS: 0.3% chance of exploitation in the next 30 days.

A vulnerability in the web-based management interface of Cisco IoT Field Network Director could allow an authenticated, remote attacker with low privileges to cause a DoS condition on a remotely managed router. This vulnerability is due to improper error handling. An attacker could exploit this vulnerability by submitting crafted input to the web-based management interface. A successful exploit could allow the attacker to request unauthorized files from a remote router, causing the router to reload and resulting in a DoS condition.

Affected products

• Cisco IoT Field Network Director: before 5.0.0-117 (fixed in 5.0.0-117)

Published 2026-05-06. Last modified 2026-06-30.