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CVE-2026-20038— Cisco Nexus 9000 Series Fabric Switches in ACI Mode Policy-Based Redirect Endpoint Group Contract Bypass Vulnerability

Quick assessment

Affected
Cisco Cisco NX-OS System Software in ACI Mode
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco Nexus 9000 系列交换机在 ACI 模式下运行的端点组（EPG）合同功能存在一个漏洞，可能导致未经身份验证的远程攻击者绕过已配置的 EPG 合同。 该漏洞源于对 EPG 合同的控制不当。攻击者可以通过受影响设备发送使用 DHCP 流量所分配的 UDP 源端口和目的端口的 IPv4 或 IPv6 数据包，从而利用此漏洞。成功利用该漏洞将使攻击者能够绕过受影响设备上的 EPG 合同保护。

CVSS 5.8 · Medium

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2026-20038

Vulnerability Information
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Vulnerability Title
Cisco Nexus 9000 Series Fabric Switches in ACI Mode Policy-Based Redirect Endpoint Group Contract Bypass Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco NX-OS System Software in ACI Mode 15.2(1g) -

II. Public POCs for CVE-2026-20038

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III. Intelligence Information for CVE-2026-20038

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Other References for CVE-2026-20038 (1)

Same Patch Batch · Cisco · 2026-10-07 · 36 CVEs total

CVE-2026-76482 10.0 CRITICAL Cisco License On-Prem Security Hardening Release
CVE-2026-76465 9.8 CRITICAL Cisco Nexus 3000 and 9000 Series Switches MPLS OAM Remote Code Execution Vulnerability
CVE-2026-76455 9.8 CRITICAL Cisco NX-OS Software Security Hardening Release: October 2026 - Improper Access Control Vu
CVE-2026-76471 9.8 CRITICAL Cisco NX-OS Software NX-API Remote Code Execution Vulnerability
CVE-2026-76480 9.8 CRITICAL Cisco License On-Prem Security Hardening Release
CVE-2026-76500 9.8 CRITICAL Cisco Application Policy Infrastructure Controller Hardening Release: October 2026 - Impro
CVE-2026-76501 9.8 CRITICAL Cisco Nexus 9000 Series Switches SRv6 OAM (NGOAM) Remote Code Execution Vulnerability
CVE-2026-76498 9.8 CRITICAL Cisco Application Policy Infrastructure Controller Hardening Release: October 2026 - Impro
CVE-2026-76499 9.8 CRITICAL Cisco Application Policy Infrastructure Controller Hardening Release: October 2026 - Impro
CVE-2026-76486 9.8 CRITICAL Cisco Nexus 3000 and 9000 Series Switches VXLAN OAM (NGOAM) Remote Code Execution Vulnerab
CVE-2026-76485 9.8 CRITICAL Cisco Nexus 3000 and 9000 Series Switches VXLAN OAM (NGOAM) Remote Code Execution Vulnerab
CVE-2026-76464 9.6 CRITICAL Cisco Meraki Hardening Release October 2026 - Buffer Management Vulnerabilities
CVE-2026-76454 9.1 CRITICAL Cisco Smart Software Manager On-Prem Unauthenticated API Vulnerability
CVE-2026-76483 9.1 CRITICAL Cisco License On-Prem Security Hardening Release
CVE-2026-20328 9.1 CRITICAL Cisco Smart Software Manager On-Prem Arbitrary Account Password Reset Vulnerability
CVE-2026-76484 8.8 HIGH Cisco License On-Prem Security Hardening Release
CVE-2026-76453 8.8 HIGH Cisco NX-OS Software Security Hardening Release: October 2026 - Improper Neutralization Vu
CVE-2026-76463 8.8 HIGH Cisco Meraki Security Hardening Release: October 2026 - Improper Access Control Vulnerabil
CVE-2026-76459 8.8 HIGH Cisco NX-OS Software Security Hardening Release: October 2026 - Out-of-bounds Write Vulner
CVE-2026-76470 8.8 HIGH Cisco Meraki Hardening Release - Incorrect Calculation Vulnerabilities

Showing top 20 of 36 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Cisco NX-OS System Software in ACI Mode
Same vendor: Cisco
Same weakness: CWE-284

V. Comments for CVE-2026-20038

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