How severe is CVE-2018-7789?

CVE-2018-7789 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-7789 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-7789?

CVE-2018-7789 affects Schneider-electric Modicon M221 Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-7789?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-7789 published?

CVE-2018-7789 was published on 2018-08-29 and last updated on 2026-06-17.

CVE-2018-7789

CVE-2018-7789 is a high-severity vulnerability in Schneider-electric Modicon M221 Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-754.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-754
Affected product: Schneider-electric Modicon M221 Firmware
Published: 2018-08-29
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2018-7789?: 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.
How severe is CVE-2018-7789?: CVE-2018-7789 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-7789 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-7789?: CVE-2018-7789 affects Schneider-electric Modicon M221 Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-7789?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-7789 published?: CVE-2018-7789 was published on 2018-08-29 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:schneider-electric:modicon_m221_firmware:*:*:*:*:*:*:*:*

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