CVE-2026-20038

Medium5.8 Published on Oct 7, 2026

A vulnerability in the endpoint group (EPG) contract functionality of Cisco Nexus 9000 Series Fabric Switches in ACI Mode could allow an unauthenticated, remote attacker to bypass configured EPG contracts. This vulnerability is due to an improper control with EPG contracts. An attacker could exploit this vulnerability by sending IPv4 or IPv6 packets using UDP source and destination ports that are assigned to DHCP traffic through an affected device. A successful exploit could allow the attacker to bypass EPG contracts on the affected device.

CVSS score5.8 / 10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Weakness type (CWE)CWE-284

Vulnerabilities

Cisco Fixes 35 Flaws, Including Root-Level Attack Paths in NX-OS

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Oct 8, 202616:58 5 min readRead

This product uses the NVD API but is not endorsed or certified by the NVD.

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Cisco Fixes 35 Flaws, Including Root-Level Attack Paths in NX-OS