HOMEVULNERABILITIESCVE-2020-7540
CRITICAL

CVE-2020-7540

CWE-306Published: December 11, 2020· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2020-7540 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

schneider-electric46 product(s)
modicon m340 bmxp341000 firmwaremodicon m340 bmxp341000modicon m340 bmxp342000 firmwaremodicon m340 bmxp342000modicon m340 bmxp3420102 firmwaremodicon m340 bmxp3420102modicon m340 bmxp3420102cl firmwaremodicon m340 bmxp3420102clmodicon m340 bmxp342020 firmwaremodicon m340 bmxp342020modicon m340 bmxp3420302 firmwaremodicon m340 bmxp3420302+34
Source: NVD CPE · 46 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.se.com/ww/en/download/document/SEVD-2020-343-04/
ADVISORYhttps://www.se.com/ww/en/download/document/SEVD-2020-343-04/

All References (2)

→
https://www.se.com/ww/en/download/document/SEVD-2020-343-04/Vendor Advisory
→
https://www.se.com/ww/en/download/document/SEVD-2020-343-04/Vendor Advisory

Quick Facts

CVE IDCVE-2020-7540
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-306
CISA KEVNo
Affected1 vendor(s)
PublishedDec 11, 2020

Related CVEs (CWE-306)

CVE-2020-26822
10.0
CVE-2020-26821
10.0
CVE-2014-9197
10.0
CVE-2007-0956
10.0
CVE-2026-56163
10.0
CVE-2020-26823
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-7540 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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