What is CVE-2019-6811?

CVE-2019-6811 is a high-severity vulnerability in Schneider-Electric Modicon Quantum 140noe77101, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2019-09-17.

How severe is CVE-2019-6811?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Schneider-Electric Modicon Quantum 140noe77101

CVE-2019-6811

An Improper Check for Unusual or Exceptional Conditions (CWE-754) vulnerability exists in Modicon Quantum 140 NOE771x1 version 6.9 and earlier, which could cause denial of service when the module receives an IP fragmented packet with a length greater than 65535 bytes. The module then requires a power cycle to recover.

Published 2019-09-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

www.schneider-electric.com/en/download/document/SEVD-2019-253-02/ (Vendor Advisory)

Frequently asked questions

What is CVE-2019-6811?: CVE-2019-6811 is a high-severity vulnerability in Schneider-Electric Modicon Quantum 140noe77101, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 7.5/10. Published 2019-09-17.
How severe is CVE-2019-6811?: High severity. CVSS v3 base score is 7.5 out of 10.