How severe is CVE-2018-7788?

CVE-2018-7788 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-7788 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-7788?

CVE-2018-7788 affects Schneider-electric Modicon Quantum Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-7788?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-7788 published?

CVE-2018-7788 was published on 2019-05-22 and last updated on 2026-06-17.

CVE-2018-7788

CVE-2018-7788 is a medium-severity vulnerability in Schneider-electric Modicon Quantum Firmware with a CVSS 3.x base score of 6.5. 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-255.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-255
Affected product: Schneider-electric Modicon Quantum Firmware
Published: 2019-05-22
Last modified: 2026-06-17

Description

A CWE-255 Credentials Management vulnerability exists in Modicon Quantum with firmware versions prior to V2.40. which could cause a Denial Of Service when using a Telnet connection.

Frequently asked questions

What is CVE-2018-7788?: A CWE-255 Credentials Management vulnerability exists in Modicon Quantum with firmware versions prior to V2.40. which could cause a Denial Of Service when using a Telnet connection.
How severe is CVE-2018-7788?: CVE-2018-7788 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-7788 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-7788?: CVE-2018-7788 affects Schneider-electric Modicon Quantum Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-7788?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-7788 published?: CVE-2018-7788 was published on 2019-05-22 and last updated on 2026-06-17.

References

https://www.schneider-electric.com/en/download/document/SEVD-2019-134-08/

Affected products (1)

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

More vulnerabilities in Schneider-electric Modicon Quantum Firmware

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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-2019-6816 — Critical (CVSS 9.1): In Modicon Quantum all firmware versions, a CWE-94: Code Injection vulnerability could cause an unauthorized firmware…
CVE-2019-6815 — Critical (CVSS 9.1): In Modicon Quantum all firmware versions, CWE-264: Permissions, Privileges, and Access Control vulnerabilities could…

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