Is CVE-2021-25849 actively exploited?

No active exploitation of CVE-2021-25849 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-25849 be exploited remotely?

Yes. CVE-2021-25849 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-25849?

CVE-2021-25849 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2021-25849

HIGH

CVE-2021-25849

CWE-191Published: May 10, 2021· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-25849 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

moxa32 product(s)

vport 06ec-2v26m firmwarevport 06ec-2v26mvport 06ec-2v36m-t firmwarevport 06ec-2v36m-tvport 06ec-2v36m-ct firmwarevport 06ec-2v36m-ctvport 06ec-2v36m-ct-t firmwarevport 06ec-2v36m-ct-tvport 06ec-2v42m firmwarevport 06ec-2v42mvport 06ec-2v42m-t firmwarevport 06ec-2v42m-t+20

Source: NVD CPE · 32 total CPE entries