7.4

CVE-2026-20033: cisco cisco nx-os system software in aci mode

CVSS: 7.4v3.1HighDeferred
Published 25-02-2026Last modified 25-02-2026
Open JSON

Vulnerability summary

CVE-2026-20033 is a high (CVSS 7.4) vulnerability in cisco cisco nx-os system software in aci mode. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.4% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.16%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 25-02-2026
    PublishedVulnerability first disclosed.
  2. 25-02-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

0.00 pp

From 0.16% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.16%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cisco1 product
  • cisco nx-os system software in aci mode15.2(1g) | 15.2(2e) | 15.2(2f) | 15.2(2g) | 15.2(2h) | 15.2(3f) | 15.2(3e) | 15.2(3g) | 15.2(4d) | 15.2(4e) | 15.2(5c) | 15.2(5d) | 16.0(1g) | 15.2(5e) | 15.2(4f) | 15.2(6e) | 15.2(6h) | 16.0(1j) | 15.2(6g) | 15.2(7f) | 15.2(7g) | 16.0(2h) | 15.2(8d) | 16.0(2j) | 15.2(8e) | 16.0(3d) | 16.0(3e) | 15.2(8f) | 15.2(8g) | 15.3(1d) | 15.2(8h) | 16.0(4c) | 15.3(2a) | 15.2(8i) | 16.0(5h) | 15.3(2b) | 16.0(3g) | 16.0(5j) | 15.3(2c) | 16.0(6c) | 15.3(2d) | 16.1(1f) | 16.0(7e) | 16.0(8e) | 15.3(2e) | 16.0(8f) | 16.1(2f) | 16.1(2g) | 15.3(2f) | 16.0(9c) | 16.1(3f) | 16.0(9d) | 16.0(6h) | 16.0(8h) | 16.1(3g) | 16.0(9e) | 16.1(4h)

1 vendor · 1 product

References

1 links