Is CVE-2018-7790 in the CISA KEV catalog?

No. CVE-2018-7790 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-7790?

CVE-2018-7790 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2018-7790?

CVE-2018-7790 has an EPSS score of 2.48% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-7790?

Upgrade modicon m221 firmware to 1.6.2.0 or later.

CVE & CISA-KEV Catalog

CVE-2018-7790

CRITICALEPSS 83th pctl

9.8

CVSS v3

NVD

Description

An Information Management Error 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 replay authentication sequences. If an attacker exploits this vulnerability and connects to a Modicon M221, the attacker can upload the original program from the PLC.

CWE-294

How to fix

Remediation Available

modicon m221 firmwareNVD

Affected:< 1.6.2.0Fixed in:1.6.2.0CVE-2018-7790derived 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

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

2.48%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Vendor Advisory1

schneider-electric.com

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.