CVE-2020-7549

moderate-risk

Published 2020-12-11

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.

Do I need to act?

0.52% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.3/10 Medium

NETWORK / LOW complexity

Affected Products (19)

Modicon M340 Bmxp341000 Firmware

Modicon M340 Bmxp342000 Firmware

Modicon M340 Bmxp3420102 Firmware

Modicon M340 Bmxp3420102Cl Firmware

Modicon M340 Bmxp342020 Firmware

Modicon M340 Bmxp3420302 Firmware

Modicon M340 Bmxp3420302Cl Firmware

Bmxnoe0100 Firmware

Bmxnoe0110 Firmware

Bmxnoc0401 Firmware

140Noe77111 Firmware

140Noc78100 Firmware

140Noc78000 Firmware

140Cpu65150 Firmware

Tsxety4103 Firmware

Tsxety5103 Firmware

Tsxp574634 Firmware

Tsxp575634 Firmware

Tsxp576634 Firmware

Affected Vendors

Schneider-Electric

References (2)

Vendor Advisory https://www.se.com/ww/en/download/document/SEVD-2020-343-06/

/ 100

moderate-risk

Severity 21/34 · High

Exploitability 2/34 · Minimal

Exposure 19/34 · Moderate