All vulnerabilities
CVE-2026-20038

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

Cisco Cisco NX-OS System Software in ACI ModeNetwork & edge
Open in ThreatlineRecord JSON
CVSS
5.8Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.30%Chance of exploitation activity in the next 30 days, higher than 21% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published7 Oct 2026Updated 7 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

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.

Text from CVE List

Affected versions 30

  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(1g)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(2e)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(2f)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(2g)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(2h)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(3f)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(3e)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(3g)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(4d)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(4e)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(5c)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(5d)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 16.0(1g)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(5e)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(4f)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(6e)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(6h)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 16.0(1j)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(6g)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(7f)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(7g)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 16.0(2h)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(8d)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 16.0(2j)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(8e)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 16.0(3d)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 16.0(3e)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(8f)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.2(8g)CVE List
  • Cisco NX-OS System Software in ACI Modeaffected: 15.3(1d)CVE List

References 1