How severe is CVE-2018-7821?

CVE-2018-7821 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-2018-7821 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-7821?

CVE-2018-7821 primarily affects Schneider-electric Somachine Basic. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-7821?

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-2018-7821 published?

CVE-2018-7821 was published on 2019-05-22 and last updated on 2026-06-17.

CVE-2018-7821

CVE-2018-7821 is a high-severity vulnerability in Schneider-electric Somachine Basic 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-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-770
Affected product: Schneider-electric Somachine Basic
Published: 2019-05-22
Last modified: 2026-06-17

Description

An Environment (CWE-2) vulnerability exists in SoMachine Basic, all versions, and Modicon M221(all references, all versions prior to firmware V1.10.0.0) which could cause cycle time impact when flooding the M221 ethernet interface while the Ethernet/IP adapter is activated.

Frequently asked questions

What is CVE-2018-7821?: An Environment (CWE-2) vulnerability exists in SoMachine Basic, all versions, and Modicon M221(all references, all versions prior to firmware V1.10.0.0) which could cause cycle time impact when flooding the M221 ethernet interface while the Ethernet/IP adapter is activated.
How severe is CVE-2018-7821?: CVE-2018-7821 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-2018-7821 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-7821?: CVE-2018-7821 primarily affects Schneider-electric Somachine Basic. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-7821?: 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-2018-7821 published?: CVE-2018-7821 was published on 2019-05-22 and last updated on 2026-06-17.

References

https://www.schneider-electric.com/en/download/document/SEVD-2019-045-01/

Affected products (2)

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

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