Is CVE-2018-7789 in the CISA KEV catalog?

No. CVE-2018-7789 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-7789?

CVE-2018-7789 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2018-7789?

CVE-2018-7789 has an EPSS score of 2.80% (85th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-7789?

Upgrade modicon m221 firmware to 1.6.2.0 or later.

CVE & CISA-KEV Catalog

CVE-2018-7789

HIGHEPSS 85th pctl

7.5

CVSS v3

NVD

Description

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.

CWE-754

How to fix

Remediation Available

modicon m221 firmwareNVD

Affected:< 1.6.2.0Fixed in:1.6.2.0CVE-2018-7789derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

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

Exploit Intelligence

2.80%probability of exploitation in 30 days

85thpercentile

Elevated risk: more likely to be exploited than 85% of all known CVEs.

References

Vendor Advisory1

schneider-electric.com

Mitigation1

ics-cert.us-cert.gov

Third-Party Advisory1

securityfocus.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-29.