Is CVE-2018-7809 actively exploited?

No active exploitation of CVE-2018-7809 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2018-7809 be exploited remotely?

Yes. CVE-2018-7809 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2018-7809?

CVE-2018-7809 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2018-7809

CRITICAL

CVE-2018-7809

CWE-640Published: November 30, 2018· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

An Unverified Password Change vulnerability exists in the embedded web servers in all Modicon M340, Premium, Quantum PLCs and BMXNOR0200 which could allow an unauthenticated remote user to access the password delete function of the web server.

NVD Source

Technical Analysis

CVE-2018-7809 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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected Vendors & Products

schneider-electric8 product(s)

modicom m340 firmwaremodicom m340modicom premium firmwaremodicom premiummodicom quantum firmwaremodicom quantummodicom bmxnor0200h firmwaremodicom bmxnor0200h

Source: NVD CPE · 8 total CPE entries