How severe is CVE-2019-6816?

CVE-2019-6816 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2019-6816 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-6816?

CVE-2019-6816 affects Schneider-electric Modicon Quantum Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-6816?

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

When was CVE-2019-6816 published?

CVE-2019-6816 was published on 2019-05-22 and last updated on 2026-06-17.

CVE-2019-6816

CVE-2019-6816 is a critical-severity vulnerability in Schneider-electric Modicon Quantum Firmware with a CVSS 3.x base score of 9.1. 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-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v2: 6.4
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Schneider-electric Modicon Quantum Firmware
Published: 2019-05-22
Last modified: 2026-06-17

Description

In Modicon Quantum all firmware versions, a CWE-94: Code Injection vulnerability could cause an unauthorized firmware modification with possible Denial of Service when using Modbus protocol.

Frequently asked questions

What is CVE-2019-6816?: In Modicon Quantum all firmware versions, a CWE-94: Code Injection vulnerability could cause an unauthorized firmware modification with possible Denial of Service when using Modbus protocol.
How severe is CVE-2019-6816?: CVE-2019-6816 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2019-6816 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-6816?: CVE-2019-6816 affects Schneider-electric Modicon Quantum Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-6816?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-6816 published?: CVE-2019-6816 was published on 2019-05-22 and last updated on 2026-06-17.

References

https://www.schneider-electric.com/en/download/document/SEVD-2019-134-09/

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-2019-6815 — Critical (CVSS 9.1): In Modicon Quantum all firmware versions, CWE-264: Permissions, Privileges, and Access Control vulnerabilities could…
CVE-2019-6828 — High (CVSS 7.5): A CWE-248: Uncaught Exception vulnerability exists Modicon M580 (firmware version prior to V2.90), Modicon M340…

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