CVE-2018-7798

mediumpriority · track · 33OT risk · elevatedEPSS 0.007 · 51 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.66% (51st) EPSS

CVSS 6.4 · medium

Is it mine?

5 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-27

A Insufficient Verification of Data Authenticity (CWE-345) vulnerability exists in the Modicon M221, all versions, which could cause a change of IPv4 configuration (IP address, mask and gateway) when remotely connected to the device.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedModicon M221cisa_csaf_ot
Within the Modicon M221 application, users should disable all unused protocols, especially programming protocol, as described in section “Configuring Ethernet Network” of SoMachine Basic online help. This will prevent remote programming of the M221 PLC.
MitigationModicon M221cisa_csaf_ot
All controllers should reside in locked cabinets and never be left in the “Program” mode.

cvss

Technical severity, 0–10. One row per scoring source.

8.2

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.4–8.2

v2.06.4mediumAV:N/AC:L/Au:N/C:N/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 4.9

v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Lprimary · NVD / NIST USexploitability 3.9 · impact 4.2

v3.08.2highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Lsecondary · CISA US

v3.18.2highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Lsecondary · FSTEC (BDU) RU

v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Lsecondary · ENISA EU

v3.18.2highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:Lsecondaryexploitability 3.9 · impact 4.2

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-345USprimaryCWE-345USCWE-345US

affected products (5)

Products and version ranges known to be affected.

Modicon M221: all versionsall versionscisa_csaf_otUS
Schneider Electric Software, LLC Modicon M221all versionscisa_csaf_otUS
Schneider Electric SE Modicon M221, All Versions≤ Modicon M221, All Versionsenisa_euvdEU
Schneider Electric Modicon M221all versionsfstec_bduRU
schneider-electric somachine basicall versionsnvdUScpe:2.3:a:schneider-electric:somachine_basic:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-18-324-02Schneider Electric Modicon M2212018-11-20icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability could cause a change of IPv4 configuration (IP address, mask, and gateway) when remotely connected to the device.

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisa_csaf_ot nvd NVD CVE.org MITRE

published 2018-11-02modified 2026-06-17

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+1444 more

references (6)

External citations — patches, advisories, analysis.

scry

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