Cisco NX-OS Buffer Access with Incorrect Length Value (CVE-2024-20294)

medium Tenable OT Security Plugin ID 503288

Synopsis

The remote OT asset is affected by a vulnerability.

Description

A vulnerability in the Link Layer Discovery Protocol (LLDP) feature of Cisco FXOS Software and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. 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 and having an authenticated user retrieve LLDP statistics from the affected device through CLI show commands or Simple Network Management Protocol (SNMP) requests. A successful exploit could allow the attacker to cause the LLDP service to crash and stop running on the affected device. In certain situations, the LLDP crash may result in a reload of the affected device. 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).

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Solution

Refer to the vendor advisory.

Plugin Details

Severity: Medium

ID: 503288

Version: 1.2

Type: remote

Family: Tenable.ot

Published: 7/24/2025

Updated: 10/16/2025

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v3

Risk Factor: Medium

Base Score: 6.6

Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H

Vulnerability Information

CPE: cpe:/o:cisco:nexus_7000_series_switches, cpe:/o:cisco:nexus_5000_series_switches, cpe:/o:cisco:nexus_3000_series_switches, cpe:/o:cisco:nexus_9000_series_switches, cpe:/o:cisco:nexus_6000_series_switches

Required KB Items: Tenable.ot/Cisco

Exploit Ease: No known exploits are available

Patch Publication Date: 2/29/2024

Vulnerability Publication Date: 2/29/2024

Reference Information

CVE: CVE-2024-20294

CWE: 805

Detections

Analytics