An Improper Check for Unusual or Exceptional Conditions vulnerability exists in Schneider Electric's Modicon M221 product (all references,…

Published 8 y ago 2018-08-29 · modified 4 mo ago 2026-06-17 · JSON

CVSS

4.8

v3.1 · CNA

CISA KEV

not known exploited

EPSS

2.8%

percentile 87%

Public exploits

none known

An Improper Check for Unusual or Exceptional Conditions vulnerability exists in Schneider Electric's Modicon M221 product (all references, all versions prior to firmware V1.6.2.0). The vulnerability allows unauthorized users to remotely reboot Modicon M221 using crafted programing protocol frames.

CISA SSVC assessment

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 5 mo ago 2026-05-29

Exploit prediction (EPSS)

2.80% probability of exploitation in the next 30 days, higher than 87% of all scored CVEs.

CVSS scores

Assigned by	Version	Score	Vector
CISA ADP	3.1	4.8	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L`
NVD	3.1	7.5	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
CNA	3.1	4.8	`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L`
NVD	2.0	7.8	`AV:N/AC:L/Au:N/C:N/I:N/A:C`

Affected products

Schneider Electric SE Modicon M221, all references, all versions prior to firmware V1.6.2.0

Classification

Weakness

CWE-754 Improper Check for Unusual or Exceptional Conditions

References

ics-cert.us-cert.gov /advisories/ICSA-18-240-02 · x_refsource_MISC, x_transferred
schneider-electric.com /en/download/document/SEVD-2018-233-01/ · x_refsource_CONFIRM, x_transferred
securityfocus.com /bid/105171 · vdb-entry, x_refsource_BID, x_transferred

Sources

CVE List: CVE-2018-7789
NVD: CVE-2018-7789

vulnwire keeps one entry per vulnerability: the CVE id wins, then GHSA; records that alias each other are merged. Machine-readable: JSON.

Summary