How severe is CVE-2018-7794?

CVE-2018-7794 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-2018-7794 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-7794?

CVE-2018-7794 primarily affects Schneider-electric Modicon M580 Firmware. In total, 29 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-7794?

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-2018-7794 published?

CVE-2018-7794 was published on 2020-01-06 and last updated on 2026-06-17.

CVE-2018-7794

CVE-2018-7794 is a high-severity vulnerability in Schneider-electric Modicon M580 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: 5.0
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-754
Affected product: Schneider-electric Modicon M580 Firmware
Published: 2020-01-06
Last modified: 2026-06-17

Description

A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) which could cause a Denial of Service when reading data with invalid index using Modbus TCP.

Frequently asked questions

What is CVE-2018-7794?: A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) which could cause a Denial of Service when reading data with invalid index using Modbus TCP.
How severe is CVE-2018-7794?: CVE-2018-7794 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-2018-7794 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-7794?: CVE-2018-7794 primarily affects Schneider-electric Modicon M580 Firmware. In total, 29 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-7794?: 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-2018-7794 published?: CVE-2018-7794 was published on 2020-01-06 and last updated on 2026-06-17.

References

https://www.se.com/ww/en/download/document/SEVD-2019-344-01

Affected products (29)

cpe:2.3:o:schneider-electric:modicon_m580_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicon_m340_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxh5744m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxh5724m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxp576634m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxp57554m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxp575634m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxp57454m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxp574634m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxp57354m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxp573634m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxp57304m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxp57254m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxp572634m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxp57204m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxp571634m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxp57154m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:tsxp57104m_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu65150_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu65160_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu65260_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu67261_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu67060_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu67160_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu67260_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu65860_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu67861_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu65160s_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:140cpu67160s_firmware:*:*:*:*:*:*:*:*

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CVE-2020-7475 — Critical (CVSS 9.8): A CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection'),…
CVE-2019-6808 — Critical (CVSS 9.8): A CWE-284: Improper Access Control vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon…
CVE-2018-7847 — Critical (CVSS 9.8): A CWE-284: Improper Access Control vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon…
CVE-2018-7846 — Critical (CVSS 9.8): A CWE-501: Trust Boundary Violation vulnerability on connection to the Controller exists in all versions of the Modicon…
CVE-2018-7842 — Critical (CVSS 9.8): A CWE-290: Authentication Bypass by Spoofing vulnerability exists in all versions of the Modicon M580, Modicon M340,…
CVE-2019-6848 — High (CVSS 8.6): A CWE-755: Improper Handling of Exceptional Conditions vulnerability exists in Modicon M580 CPU (BMEx58*) and Modicon…

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