A CWE-754:Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M340 CPUs (BMXP34* versions prior to V3.30)…

published 2020-12-11 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-28661

cvss: 7.5; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits: 0; none known

A CWE-754:Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M340 CPUs (BMXP34* versions prior to V3.30) Modicon M340 Communication Ethernet modules (BMXNOE0100 (H) versions prior to V3.4 BMXNOE0110 (H) versions prior to V6.6 BMXNOR0200H all versions), that could cause the device to be unreachable when modifying network parameters over SNMP.

Patch / fix

fixed in 9

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
schneider-electric bmxnoe0110_firmware 6.6

Exploit prediction

1.17% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	7.8	AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

n/a Modicon M340 CPUs (BMXP34* versions prior to V3.30) and Modicon M340 Communication Ethernet modules (BMXNOE0100 (H) versions prior to V3.4, BMXNOE0110 (H) versions prior to V6.6, and BMXNOR0200H all versions)

Classification

Weakness

CWE-754 Improper Check for Unusual or Exceptional Conditions

References

security.cse.iitk.ac.in /responsible-disclosure
vendor-advisory
se.com /ww/en/download/document/SEVD-2020-343-07/
vendor-advisory

Sources

CVE List CVE-2020-7536
NVD CVE-2020-7536

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Summary