Home/CVE/A CWE-306: Missing Authentication for Critical Function vulnerability exists in the Web Server on Modicon M340, Legacy O
CVE

CVE-2020-7540

A CWE-306: Missing Authentication for Critical Function vulnerability exists in the Web Server on Modicon M340, Legacy O

A CWE-306: Missing Authentication for Critical Function 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 unauthenticated command execution in the controller when sending special HTTP requests.

CRITICAL · CVSS 9.8 EPSS 0.00309
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-306Missing Authentication for Critical Function
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Affected Products & Versions

23
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< 3.3
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Scoring & Timeline

9.8
CRITICAL · 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:H/I:H/A:H
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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-2020-343-04/Vendor Advisory
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