Vulnerability in Cisco Nx-Os System Software In Aci Mode
CVE-2026-20038
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Cisco Nx-Os System Software In Aci Mode — versions 15.2(1g), 15.2(2e), 15.2(2f)
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-20038?
- CVE-2026-20038 is a medium-severity vulnerability in Cisco Nx-Os System Software In Aci Mode, classified under Improper Access Control. CVSS score: 5.8/10. Published 2026-10-07.
- How severe is CVE-2026-20038?
- Medium severity. CVSS v3 base score is 5.8 out of 10.