Denial of Service Vulnerability in Cisco Nexus 9000 Series Fabric Switches
CVE-2026-20033

7.4HIGH

Key Information:

Vendor

Cisco
Status
Cisco Nx-os System Software In Aci Mode
Vendor
CVE Published:
25 February 2026

Badges

👾 Exploit Exists

What is CVE-2026-20033?

A vulnerability exists in the Cisco Nexus 9000 Series Fabric Switches operating in ACI mode that could enable an adjacent attacker to execute a denial of service attack. This issue arises from inadequate validation of certain Ethernet frames processed by the management interface of the device. By sending a specially crafted Ethernet frame, an attacker may force the device to reload unexpectedly, leading to service interruption. This vulnerability specifically affects only the out-of-band management interface, which can be exploited by unauthenticated individuals in proximity to the device.

Affected Version(s)

Cisco NX-OS System Software in ACI Mode 15.2(1g)

Cisco NX-OS System Software in ACI Mode 15.2(2e)

Cisco NX-OS System Software in ACI Mode 15.2(2f)

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
7.4
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.