Is CVE-2026-20033 actively exploited?

No active exploitation of CVE-2026-20033 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-20033 be exploited remotely?

Partially. CVE-2026-20033 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2026-20033?

CVE-2026-20033 has a CVSS score of 7.4 (HIGH) and an EPSS exploitation probability of 0.01%.

HOME VULNERABILITIESCVE-2026-20033

HIGH

CVE-2026-20033

CWE-805Published: February 25, 2026· Updated: Feb 27, 2026

7.4

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:2.6th

Official Description

A vulnerability in Cisco Nexus 9000 Series Fabric Switches in ACI mode could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device.

This vulnerability is due to insufficient validation when processing specific Ethernet frames. An attacker could exploit this vulnerability by sending a crafted Ethernet frame to the management interface of an affected device. A successful exploit could allow the attacker to cause the device to reload unexpectedly, resulting in a DoS condition.

Note: Only the out-of-band (OOB) management interface is affected.

NVD Source

Technical Analysis

CVE-2026-20033 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.4.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.