CVE-2021-25846

What it is

Improper validation of the ChassisID TLV in userdisk/vport_lldpd in Moxa Camera VPort 06EC-2V Series, version 1.1, allows attackers to cause a denial of service due to a negative number passed to the memcpy function via a crafted lldp packet.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

1.1% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-05-10 11:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:42 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.1% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-05-10 11:15 UTC

Last modified

2026-06-17 03:42 UTC

Exploit probability

1.1% · EPSS, next 30 days

Weakness

CWE-191

Record status

Modified

Affected

• Moxa Vport 06ec-2v26m Firmware ≤ 1.1
• Moxa Vport 06ec-2v36m-t Firmware ≤ 1.1
• Moxa Vport 06ec-2v36m-ct Firmware ≤ 1.1
• Moxa Vport 06ec-2v36m-ct-t Firmware ≤ 1.1
• Moxa Vport 06ec-2v42m Firmware ≤ 1.1
• Moxa Vport 06ec-2v42m-t Firmware ≤ 1.1
• Moxa Vport 06ec-2v42m-ct Firmware ≤ 1.1
• Moxa Vport 06ec-2v42m-ct-t Firmware ≤ 1.1

Attack profile CVSS 3.1 · 7.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

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