Home/CVE/A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in the Web Server on Modicon M340,
CVE

CVE-2020-7549

A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in the Web Server on Modicon M340,

A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in the Web Server on Modicon M340, Legacy Offers Modicon Quantum and Modicon Premium and associated Communication Modules (see security notification for affected versions), that could cause denial of HTTP and FTP services when a series of specially crafted requests is sent to the controller over HTTP.

MEDIUM · CVSS 5.3 EPSS 0.00536
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-754Improper Check for Unusual or Exceptional Conditions
▤

Affected Products & Versions

19
schneider-electric modicon m340 bmxp341000 firmware< 3.30
schneider-electric modicon m340 bmxp342000 firmware< 3.30
schneider-electric modicon m340 bmxp3420102 firmware< 3.30
schneider-electric modicon m340 bmxp3420102cl firmware< 3.30
schneider-electric modicon m340 bmxp342020 firmware< 3.30
schneider-electric modicon m340 bmxp3420302 firmware< 3.30
schneider-electric modicon m340 bmxp3420302cl firmware< 3.30
schneider-electric bmxnoe0100 firmware< 3.4
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · cybersecurity@se.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD11 Dec 2020 · 01:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.se.com/ww/en/download/document/SEVD-2020-343-06/Vendor Advisory
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