How severe is CVE-2018-7812?

CVE-2018-7812 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 high, integrity none, and availability none.

Is CVE-2018-7812 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-7812?

CVE-2018-7812 primarily affects Schneider-electric Modicom M340 Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-7812?

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-2018-7812 published?

CVE-2018-7812 was published on 2018-12-17 and last updated on 2026-06-17.

CVE-2018-7812

CVE-2018-7812 is a high-severity vulnerability in Schneider-electric Modicom M340 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-200.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Schneider-electric Modicom M340 Firmware
Published: 2018-12-17
Last modified: 2026-06-17

Description

An Information Exposure through Discrepancy vulnerability exists in the embedded web servers in all Modicon M340, Premium, Quantum PLCs and BMXNOR0200 where the web server sends different responses in a way that exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.

Frequently asked questions

What is CVE-2018-7812?: An Information Exposure through Discrepancy vulnerability exists in the embedded web servers in all Modicon M340, Premium, Quantum PLCs and BMXNOR0200 where the web server sends different responses in a way that exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.
How severe is CVE-2018-7812?: CVE-2018-7812 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 high, integrity none, and availability none.
Is CVE-2018-7812 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-7812?: CVE-2018-7812 primarily affects Schneider-electric Modicom M340 Firmware. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-7812?: 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-2018-7812 published?: CVE-2018-7812 was published on 2018-12-17 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:o:schneider-electric:modicom_m340_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicom_premium_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicom_quantum_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:schneider-electric:modicom_bmxnor0200h_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Schneider-electric Modicom M340 Firmware

CVE-2018-7811 — Critical (CVSS 9.8): An Unverified Password Change vulnerability exists in the embedded web servers in all Modicon M340, Premium, Quantum…
CVE-2018-7809 — Critical (CVSS 9.8): An Unverified Password Change vulnerability exists in the embedded web servers in all Modicon M340, Premium, Quantum…
CVE-2018-7831 — High (CVSS 8.8): An Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS) vulnerability exists in the embedded…
CVE-2018-7833 — High (CVSS 7.5): An Improper Check for Unusual or Exceptional Conditions vulnerability exists in the embedded web servers in all Modicon…
CVE-2018-7830 — High (CVSS 7.5): Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') vulnerability exists in the…
CVE-2018-7804 — Medium (CVSS 6.1): A URL Redirection to Untrusted Site vulnerability exists in the embedded web servers in all Modicon M340, Premium,…

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