Detections
Analytics
Cisco Nexus 9000 Series Fabric Switches in ACI Mode Endpoint Group Contract Bypass (cisco-sa-aci-epgcbp-SfDU7NLf)
medium Nessus Plugin ID 363870
Synopsis
The remote device is missing a vendor-supplied security patchDescription
According to its self-reported version, Cisco NX-OS System Software in ACI Mode is affected by a vulnerability.- 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 toDHCP traffic through an affected device. A successful exploit could allow the attacker to bypass EPG contracts on the affected device. (CVE-2026-20038)
Please see the included Cisco BIDs and Cisco Security Advisory for more information.
Solution
Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwr18270See Also
Plugin Details
Severity: Medium
ID: 363870
File Name: cisco-sa-aci-epgcbp-SfDU7NLf.nasl
Version: 1.1
Type: Combined
Family: CISCO
Published: 10/7/2026
Updated: 10/7/2026
Configuration: Enable paranoid mode
Supported Sensors: Nessus
Risk Information
CVSS v2
Risk Factor: Medium
Base Score: 5
Temporal Score: 3.7
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N
CVSS Score Source: CVE-2026-20038
CVSS v3
Risk Factor: Medium
Base Score: 5.8
Temporal Score: 5.1
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:cisco:nx-os
Required KB Items: Settings/ParanoidReport, Host/Cisco/NX-OS/Version, Host/Cisco/NX-OS/Model, Host/Cisco/NX-OS/Device, Host/aci/system/chassis/summary
Exploit Ease: No known exploits are available
Patch Publication Date: 10/7/2026
Vulnerability Publication Date: 10/7/2026
Reference Information
CVE: CVE-2026-20038