CVE-2020-7540

9.8 CRITICAL 2% exploit odds Fix listed Auth & access Device

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
Exploit odds: 2.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2020-12-11 01:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:24 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 2.3% in the next 30 days (EPSS).
Severity: 9.8 CRITICAL (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2020-12-11 01:15 UTC
Last modified: 2026-06-17 03:24 UTC
Exploit probability: 2.3% · EPSS, next 30 days
Weakness: CWE-306 · Missing authentication
Record status: Modified

Affected

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

Attack profile CVSS 3.1 · 9.8

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record