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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Cisco Cisco NX-OS System Software in ACI Mode unknown
Version Status Constraints
15.2(1g) affected —
15.2(2e) affected —
15.2(2f) affected —
15.2(2g) affected —
15.2(2h) affected —
15.2(3f) affected —
15.2(3e) affected —
15.2(3g) affected —
15.2(4d) affected —
15.2(4e) affected —
15.2(5c) affected —
15.2(5d) affected —
16.0(1g) affected —
15.2(5e) affected —
15.2(4f) affected —
15.2(6e) affected —
15.2(6h) affected —
16.0(1j) affected —
15.2(6g) affected —
15.2(7f) affected —
15.2(7g) affected —
16.0(2h) affected —
15.2(8d) affected —
16.0(2j) affected —
15.2(8e) affected —
16.0(3d) affected —
16.0(3e) affected —
15.2(8f) affected —
15.2(8g) affected —
15.3(1d) affected —
15.2(8h) affected —
16.0(4c) affected —
15.3(2a) affected —
15.2(8i) affected —
16.0(5h) affected —
15.3(2b) affected —
16.0(3g) affected —
16.0(5j) affected —
15.3(2c) affected —
16.0(6c) affected —
15.3(2d) affected —
16.1(1f) affected —
16.0(7e) affected —
16.0(8e) affected —
15.3(2e) affected —
16.0(8f) affected —
16.1(2f) affected —
16.1(2g) affected —
15.3(2f) affected —
16.0(9c) affected —
16.1(3f) affected —
16.0(9d) affected —
16.0(6h) affected —
16.0(8h) affected —
16.1(3g) affected —
16.0(9e) affected —
16.1(4h) affected —
16.1(5e) affected —
16.2(1g) affected —
16.0(9f) affected —
16.2(2e) affected —

No data.

No data.

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Vendors Products
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Project Subscriptions

Vendors Products
Cisco Subscribe
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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-aci-epgcbp-SfDU7NLf cve-icon cve-icon
History

Wed, 07 Oct 2026 19:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 07 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
First Time appeared Cisco
Cisco cisco Nx-os System Software In Aci Mode
Vendors & Products Cisco
Cisco cisco Nx-os System Software In Aci Mode

Wed, 07 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Cisco Nexus 9000 Series Fabric Switches in ACI Mode Policy-Based Redirect Endpoint Group Contract Bypass Vulnerability
Weaknesses CWE-284
References
Metrics cvssV3_1

{'score': 5.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: cisco

Published:

Updated: 2026-10-07T18:05:53.253Z

Reserved: 2025-10-08T11:59:15.354Z

Link: CVE-2026-20038

cve-icon Vulnrichment

Updated: 2026-10-07T18:02:43.964Z

cve-icon NVD

Status : Received

Published: 2026-10-07T17:16:54.690

Modified: 2026-10-07T19:17:36.873

Link: CVE-2026-20038

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-07T18:30:14Z

Weaknesses