No exploitation reportedFix available

CVE-2020-7540

Q: Is CVE-2020-7540 actively exploited?

Active exploitation of CVE-2020-7540 has not been confirmed. Its EPSS score was 2.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-7540?

CVE-2020-7540 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2020-12-11
Fixed in6.1
WeaknessCWE-306

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2020-12-1101:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-7540?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-7540?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Schneider-electric 140cpu65150 firmwareversion to verify

Branch	Affected	Fixed in	Source
6.1	< 6.1	6.1	NVD

Schneider-electric 140cpu65160 firmwareversion to verify

Branch	Affected	Fixed in	Source
6.1	< 6.1	6.1	NVD

Schneider-electric 140noc77101 firmwareversion to verify

Branch	Affected	Fixed in	Source
1.8	< 1.08	1.08	NVD

20 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Schneider-electric 140cpu65150 firmware to 6.1

Advisories and patches

www.se.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
CNAweakness (CWE)CWE-306read 2026-10-23
FIRST EPSSEPSS score2.3 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2020-12-11
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-7540?

Is CVE-2020-7540 actively exploited?

Active exploitation of CVE-2020-7540 has not been confirmed. Its EPSS score was 2.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-7540?

CVE-2020-7540 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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