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Fencer Vulns
critical 9.8

CVE-2020-7540 json

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

published 2020-12-11 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-28665

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

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.

Patch / fix

  • 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
  • schneider-electric bmxnoe0110_firmware 6.5
  • schneider-electric 140noe77101_firmware 7.1
  • schneider-electric 140noe77111_firmware 7.1
  • schneider-electric 140cpu65150_firmware 6.1
  • schneider-electric 140cpu65160_firmware 6.1
  • schneider-electric 140noc78000_firmware 1.74
  • schneider-electric 140noc78100_firmware 1.74
  • schneider-electric 140noc77101_firmware 1.08
  • schneider-electric tsxp574634_firmware 6.1
  • schneider-electric tsxp575634_firmware 6.1
  • schneider-electric tsxp576634_firmware 6.1
  • schneider-electric tsxety4103_firmware 6.2

Exploit prediction

2.32% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • n/a Web Server on Modicon M340, Legacy Offers Modicon Quantum and Modicon Premium and associated Communication Modules (see security notification for affected versions)

Classification

Weakness
  • CWE-306 Missing Authentication for Critical Functionality

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.