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    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:Oct 7, 2026
    Last Modified:Oct 7, 2026
    EPS:Oct 7, 2026
    EPSS Score:
    CVSS Score:5.8

    Affected Products

    Vendor
    Cisco
    Product
    Cisco Nx-os System Software In Aci Mode

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-284 Improper Access Control

    Related CVEs

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    CVE-2026-76457 (CVSS 8.6) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco NX-OS engineering t…
    CVE-2026-76456 (CVSS 8.6) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco NX-OS engineering t…
    CVE-2026-76453 (CVSS 8.8) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco NX-OS engineering t…
    CVE-2026-20033 (CVSS 7.4) — A vulnerability in Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an unauthenticated, adjacen…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High