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Fencer Intel
medium 6.3

CVE-2020-7564 json

A CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability exists in the Web Server on Modicon M340, M…

published 5y ago modified 4mo ago also EUVD-2020-28689

cvss
6.3
version 3.1, CNA
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

Summary

A CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability exists in the Web Server on Modicon M340, Modicon Quantum and Modicon Premium Legacy offers and their Communication Modules (see notification for details) which could cause write access and the execution of commands when uploading a specially crafted file on the controller over FTP.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-005-01 updated cvss 6.3

Schneider Electric Web Server on Modicon M340

  • Schneider Electric Software, LLC M340 Communication Ethernet modules BMX NOC 0401 Schneider Electric Software, LLC M340 Communication Ethernet modules BMX NOE 0100 (H) Schneider Electric Software, LLC M340 Communication Ethernet modules BMX NOE 0110 (H) Schneider Electric Software, LLC M340 Communication Ethernet modules BMX NOR 0200H Schneider Electric Software, LLC M340 CPUs BMX P34x Schneider Electric Software, LLC Premium communication modules TSXETY4103 *, TSXETY5103 *
    +5 more products
    Schneider Electric Software, LLC Premium processors with integrated Ethernet COPRO TSXP574634 TSXP575634 TSXP576634 Schneider Electric Software, LLC Quantum communication modules 140NOC78x00 Schneider Electric Software, LLC Quantum communication modules 140NOC77101 Schneider Electric Software, LLC Quantum communication modules 140NOE771x1 Schneider Electric Software, LLC Quantum processors with integrated Ethernet COPRO 140CPU65xxxxx
    affected: mitigation “Disable FTP via UnityPro / Ecostruxure Control Expert. This is disabled by default when a new application is created.” se.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5mo ago

Exploit prediction

1.18% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P

Affected products

  • n/a Web Server on Modicon M340, Modicon Quantum and Modicon Premium Legacy offers and their Communication Modules (see notification for details)

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input

References

Sources

Fencer Intel 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.