CVE-2025-20111 — Cisco Nexus 3000 and 9000 Series Switches Layer 2 Ethernet Denial of Service Vulnerability

Back Back to CVE browser

HIGH

Cisco Nexus 3000 and 9000 Series Switches Layer 2 Ethernet Denial of Service Vulnerability

Published Feb 26, 2025

7.4

HIGH

CVSS 3.1

EPSS 0.32%

Description

A vulnerability in the health monitoring diagnostics of Cisco Nexus 3000 Series Switches and Cisco Nexus 9000 Series Switches in standalone NX-OS mode could allow an unauthenticated, adjacent attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to the incorrect handling of specific Ethernet frames. An attacker could exploit this vulnerability by sending a sustained rate of crafted Ethernet frames to an affected device. A successful exploit could allow the attacker to cause the device to reload.

Affected products

Vendor Cisco Product Cisco NX-OS Software Default
n/a
- Version
  10.1(1)
  Status
  affected
  Constraints
  -
- Version
  10.1(2)
  Status
  affected
  Constraints
  -
- Version
  10.1(2t)
  Status
  affected
  Constraints
  -
- Version
  10.2(1)
  Status
  affected
  Constraints
  -
- Version
  10.2(1q)
  Status
  affected
  Constraints
  -
- Version
  10.2(2)
  Status
  affected
  Constraints
  -
- Version
  10.2(2a)
  Status
  affected
  Constraints
  -
- Version
  10.2(3)
  Status
  affected
  Constraints
  -
- Version
  10.2(3t)
  Status
  affected
  Constraints
  -
- Version
  10.2(3v)
  Status
  affected
  Constraints
  -
- Version
  10.2(4)
  Status
  affected
  Constraints
  -
- Version
  10.2(5)
  Status
  affected
  Constraints
  -
- Version
  10.2(6)
  Status
  affected
  Constraints
  -
- Version
  10.2(7)
  Status
  affected
  Constraints
  -
- Version
  10.2(8)
  Status
  affected
  Constraints
  -
- Version
  10.3(1)
  Status
  affected
  Constraints
  -
- Version
  10.3(2)
  Status
  affected
  Constraints
  -
- Version
  10.3(3)
  Status
  affected
  Constraints
  -
- Version
  10.3(3o)
  Status
  affected
  Constraints
  -
- Version
  10.3(3p)
  Status
  affected
  Constraints
  -
- Version
  10.3(3q)
  Status
  affected
  Constraints
  -
- Version
  10.3(3r)
  Status
  affected
  Constraints
  -
- Version
  10.3(3w)
  Status
  affected
  Constraints
  -
- Version
  10.3(3x)
  Status
  affected
  Constraints
  -
- Version
  10.3(4)
  Status
  affected
  Constraints
  -
- Version
  10.3(4a)
  Status
  affected
  Constraints
  -
- Version
  10.3(4g)
  Status
  affected
  Constraints
  -
- Version
  10.3(4h)
  Status
  affected
  Constraints
  -
- Version
  10.3(5)
  Status
  affected
  Constraints
  -
- Version
  10.3(99w)
  Status
  affected
  Constraints
  -
- Version
  10.3(99x)
  Status
  affected
  Constraints
  -
- Version
  10.4(1)
  Status
  affected
  Constraints
  -
- Version
  10.4(2)
  Status
  affected
  Constraints
  -
- Version
  10.4(3)
  Status
  affected
  Constraints
  -
- Version
  10.5(1)
  Status
  affected
  Constraints
  -
- Version
  9.3(1)
  Status
  affected
  Constraints
  -
- Version
  9.3(10)
  Status
  affected
  Constraints
  -
- Version
  9.3(11)
  Status
  affected
  Constraints
  -
- Version
  9.3(12)
  Status
  affected
  Constraints
  -
- Version
  9.3(13)
  Status
  affected
  Constraints
  -
- Version
  9.3(14)
  Status
  affected
  Constraints
  -
- Version
  9.3(1z)
  Status
  affected
  Constraints
  -
- Version
  9.3(2)
  Status
  affected
  Constraints
  -
- Version
  9.3(3)
  Status
  affected
  Constraints
  -
- Version
  9.3(4)
  Status
  affected
  Constraints
  -
- Version
  9.3(5)
  Status
  affected
  Constraints
  -
- Version
  9.3(5w)
  Status
  affected
  Constraints
  -
- Version
  9.3(6)
  Status
  affected
  Constraints
  -
- Version
  9.3(7)
  Status
  affected
  Constraints
  -
- Version
  9.3(7a)
  Status
  affected
  Constraints
  -
- Version
  9.3(7k)
  Status
  affected
  Constraints
  -
- Version
  9.3(8)
  Status
  affected
  Constraints
  -
- Version
  9.3(9)
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Cisco

Cisco NX-OS Software

n/a

Version	Status	Constraints
10.1(1)	affected	-
10.1(2)	affected	-
10.1(2t)	affected	-
10.2(1)	affected	-
10.2(1q)	affected	-
10.2(2)	affected	-
10.2(2a)	affected	-
10.2(3)	affected	-
10.2(3t)	affected	-
10.2(3v)	affected	-
10.2(4)	affected	-
10.2(5)	affected	-
10.2(6)	affected	-
10.2(7)	affected	-
10.2(8)	affected	-
10.3(1)	affected	-
10.3(2)	affected	-
10.3(3)	affected	-
10.3(3o)	affected	-
10.3(3p)	affected	-
10.3(3q)	affected	-
10.3(3r)	affected	-
10.3(3w)	affected	-
10.3(3x)	affected	-
10.3(4)	affected	-
10.3(4a)	affected	-
10.3(4g)	affected	-
10.3(4h)	affected	-
10.3(5)	affected	-
10.3(99w)	affected	-
10.3(99x)	affected	-
10.4(1)	affected	-
10.4(2)	affected	-
10.4(3)	affected	-
10.5(1)	affected	-
9.3(1)	affected	-
9.3(10)	affected	-
9.3(11)	affected	-
9.3(12)	affected	-
9.3(13)	affected	-
9.3(14)	affected	-
9.3(1z)	affected	-
9.3(2)	affected	-
9.3(3)	affected	-
9.3(4)	affected	-
9.3(5)	affected	-
9.3(5w)	affected	-
9.3(6)	affected	-
9.3(7)	affected	-
9.3(7a)	affected	-
9.3(7k)	affected	-
9.3(8)	affected	-
9.3(9)	affected	-

Remediation

No remediation recorded yet.

Metrics

0.32% 0.00321

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00321

Score over time

2025–2026

EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v3
EPSS v4
EPSS v5

Table of values (4 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.32% (0.00321)	22.82th	v5 (v2026.06.15)
Jun 15, 2026	0.30% (0.00304)	21.88th	v5 (v2026.06.15)
Mar 17, 2025	0.03% (0.00032)	6.02th	v4 (v2025.03.14)
Feb 27, 2025	0.04% (0.00044)	15.32th	v3 (v2023.03.01)

Weaknesses (1)

CWE-1220

References (1)

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n3kn9k-healthdos-eOqSWK4g

Link	Providers	Tags
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-n3kn9k-healthdos-eOqSWK4g

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Feb 26, 2025

Updated Feb 26, 2025

Reserved Oct 10, 2024

Link CVE-2025-20111

CISA Vulnrichment

Updated Feb 26, 2025

NVD

Status Deferred

Modified Jun 17, 2026

Link CVE-2025-20111

Red Hat

Severity n/a

Public date n/a

Links CVE-2025-20111