7.5

CVE-2018-7821: schneider-electric modicon_m221_firmware

CVSS: 7.5v3.1HighModified
Published 22-05-2019Last modified 29-05-2026
Open JSON

Vulnerability summary

CVE-2018-7821 is a high (CVSS 7.5) vulnerability in schneider-electric modicon_m221_firmware. EPSS estimates a 1.10% chance of exploitation in the next 30 days, higher than 65% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
1.10%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 22-05-2019
    PublishedVulnerability first disclosed.
  2. 29-05-2026
    Last modifiedVulnerability information updated.

Description

An Environment (CWE-2) vulnerability exists in SoMachine Basic, all versions, and Modicon M221(all references, all versions prior to firmware V1.10.0.0) which could cause cycle time impact when flooding the M221 ethernet interface while the Ethernet/IP adapter is activated.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.10%

Chance of exploitation in the next 30 days

Percentile

65%

Versus all other CVEs

30-day change

0.00 pp

From 1.10% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.10%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Schneider-electric1 product

1 vendor · 1 product

References

1 links