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CVE PROGRAM SOURCE RECORD7.4 High

CVE-2026-20010

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

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Status
Published
Published
Updated
Assigning organization
cisco

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).

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Cisco Cisco NX-OS Software

Default version status: unknown

  • 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 Cisco NX-OS System Software in ACI Mode

Default version status: unknown

  • 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 Cisco Unified Computing System (Managed)

Default version status: unknown

  • 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