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Vulnerability record · CVE-2021-22800 · published 11 February 2022

CVE-2021-22800: Schneider-electric modicon m218 firmware improper input validation vulnerability

Schneider Electric · Modicon M218 Firmware

A CWE-20: Improper Input Validation vulnerability exists that could cause a Denial of Service when a crafted packet is sent to the controller over network port 1105/TCP. Affected Product: Modicon M218 Logic Controller (V5.1.0.6 and prior)

7.5 CVSS 3.1 High EPSS 1.0% · top 38.5% CWE-20 · Improper input validation
7.5CVSS 3.1 base score, v2 5.0
1.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A CWE-20: Improper Input Validation vulnerability exists that could cause a Denial of Service when a crafted packet is sent to the controller over network port 1105/TCP. Affected Product: Modicon M218 Logic Controller (V5.1.0.6 and prior)

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-285-04 PatchVendor Advisory
https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-285-04 PatchVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-22800), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.