Is CVE-2020-5652 actively exploited?

No active exploitation of CVE-2020-5652 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2020-5652 be exploited remotely?

Yes. CVE-2020-5652 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2020-5652?

CVE-2020-5652 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2020-5652

CWE-400Published: November 2, 2020· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

Uncontrolled resource consumption vulnerability in Ethernet Port on MELSEC iQ-R, Q and L series CPU modules (R 00/01/02 CPU firmware versions '20' and earlier, R 04/08/16/32/120 (EN) CPU firmware versions '52' and earlier, R 08/16/32/120 SFCPU firmware versions '22' and earlier, R 08/16/32/120 PCPU all versions, R 08/16/32/120 PSFCPU all versions, R 16/32/64 MTCPU all versions, Q03 UDECPU, Q 04/06/10/13/20/26/50/100 UDEHCPU serial number '22081' and earlier , Q 03/04/06/13/26 UDVCPU serial number '22031' and earlier, Q 04/06/13/26 UDPVCPU serial number '22031' and earlier, Q 172/173 DCPU all versions, Q 172/173 DSCPU all versions, Q 170 MCPU all versions, Q 170 MSCPU all versions, L 02/06/26 CPU (-P) and L 26 CPU - (P) BT all versions) allows a remote unauthenticated attacker to stop the Ethernet communication functions of the products via a specially crafted packet, which may lead to a denial of service (DoS) condition .

NVD Source

Technical Analysis

CVE-2020-5652 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

mitsubishielectric102 product(s)

melsec q-q04udpvcpu firmwaremelsec q-q04udpvcpumelsec q-q06udpvcpu firmwaremelsec q-q06udpvcpumelsec q-q13udpvcpu firmwaremelsec q-q13udpvcpumelsec q-q26udpvcpu firmwaremelsec q-q26udpvcpumelsec q-q03udvcpu firmwaremelsec q-q03udvcpumelsec q-q04udvcpu firmwaremelsec q-q04udvcpu+90

Source: NVD CPE · 102 total CPE entries