Moxa VPort Cameras Integer Underflow (CVE-2021-25849)

high Tenable OT Security Plugin ID 505210

Synopsis

The remote OT asset is affected by a vulnerability.

Description

An integer underflow was discovered in userdisk/vport_lldpd in Moxa Camera VPort 06EC-2V Series, version 1.1, improper validation of the PortID TLV leads to Denial of Service via a crafted lldp packet.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Refer to the vendor advisory.

Plugin Details

Severity: High

ID: 505210

File Name: tenable_ot_moxa_CVE-2021-25849.nasl

Version: 1.1

Type: remote

Family: Tenable.ot

Published: 3/6/2026

Updated: 3/6/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2021-25849

CVSS v3

Risk Factor: High

Base Score: 7.5

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

Vulnerability Information

CPE: cpe:/o:moxa:vport_06ec-2v80m_firmware, cpe:/o:moxa:vport_06ec-2v80m-ct-t_firmware, cpe:/o:moxa:vport_06ec-2v42m-ct-t_firmware, cpe:/o:moxa:vport_06ec-2v36m-ct_firmware, cpe:/o:moxa:vport_06ec-2v80m-ct_firmware, cpe:/o:moxa:vport_06ec-2v60m_firmware, cpe:/o:moxa:vport_06ec-2v36m-ct-t_firmware, cpe:/o:moxa:vport_06ec-2v80m-t_firmware, cpe:/o:moxa:vport_06ec-2v42m_firmware, cpe:/o:moxa:vport_06ec-2v60m-ct_firmware, cpe:/o:moxa:vport_06ec-2v36m-t_firmware, cpe:/o:moxa:vport_06ec-2v26m_firmware, cpe:/o:moxa:vport_06ec-2v60m-ct-t_firmware, cpe:/o:moxa:vport_06ec-2v42m-ct_firmware, cpe:/o:moxa:vport_06ec-2v60m-t_firmware, cpe:/o:moxa:vport_06ec-2v42m-t_firmware

Required KB Items: Tenable.ot/Moxa

Exploit Ease: No known exploits are available

Patch Publication Date: 5/10/2021

Vulnerability Publication Date: 5/10/2021

Reference Information

CVE: CVE-2021-25849

CWE: 191

Detections

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