Riskcovery

CVE-2026-20010

Cisco Nexus 3000 and 9000 Series Switches Link Layer Discovery Protocol Denial of Service Vulnerability

State
Published
Severity
7.4 High
Published
Feb 25, 2026
Updated
Feb 25, 2026
Reserved
Oct 8, 2025

Read the record on cve.org

Description

A vulnerability in the Link Layer Discovery Protocol (LLDP) feature of Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause the LLDP process to restart, which could cause an affected device to reload unexpectedly.

This vulnerability is due to improper handling of specific fields in an LLDP frame. An attacker could exploit this vulnerability by sending a crafted LLDP packet to an interface of an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition. Note: LLDP is a Layer 2 link protocol. To exploit this vulnerability, an attacker would need to be directly connected to an interface of an affected device, either physically or logically (for example, through a Layer 2 Tunnel configured to transport the LLDP protocol).

Scores

CVSSScoreVectorSource
3.17.4 HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hcisco

Weaknesses

  • CWE-805 Buffer Access with Incorrect Length Value

Affected Products

ProductVersions
Cisco NX-OS SoftwareCisco
  • 10.3(1)Affected
  • 10.3(2)Affected
  • 10.3(3)Affected
  • 10.4(1)Affected
  • 10.3(99w)Affected
  • 10.3(3w)Affected
  • 10.3(99x)Affected
  • 10.3(3o)Affected
  • 10.3(4)Affected
  • 10.3(3p)Affected
  • 10.3(4a)Affected
  • 10.4(2)Affected
  • 10.3(3q)Affected
  • 10.3(3x)Affected
  • 10.3(4g)Affected
  • 10.3(3r)Affected
  • 10.3(4h)Affected
Cisco NX-OS System Software in ACI ModeCisco
  • 16.0(2h)Affected
  • 16.0(2j)Affected
  • 16.0(3d)Affected
  • 16.0(3e)Affected
  • 16.0(4c)Affected
  • 16.0(5h)Affected
  • 16.0(3g)Affected
  • 16.0(5j)Affected
  • 16.0(6c)Affected
  • 16.1(1f)Affected
  • 16.0(7e)Affected
  • 16.0(8e)Affected
  • 16.0(8f)Affected
  • 16.1(2f)Affected
  • 16.1(2g)Affected
  • 16.0(9c)Affected
  • 16.1(3f)Affected
  • 16.0(9d)Affected
  • 16.0(6h)Affected
  • 16.0(8h)Affected
  • 16.1(3g)Affected
Cisco Unified Computing System (Managed)Cisco
  • 4.3(4e)Affected
  • 4.3(6b)Affected
  • 4.3(4c)Affected
  • 4.3(4f)Affected
  • 4.3(6d)Affected
  • 4.3(5e)Affected
  • 4.3(4d)Affected
  • 4.3(4b)Affected
  • 4.3(5a)Affected
  • 4.3(5c)Affected
  • 4.3(5d)Affected
  • 4.3(6c)Affected
  • 4.3(6a)Affected

References

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