9.8

CVE-2018-7791: schneider electric se modicon m221, all references, all versions prior to firmware v1.6.2.0 Improper Authentication

CVSS: 9.8v3.1CriticalModified
Published 29-08-2018Last modified 29-05-2026
Open JSON

Vulnerability summary

CVE-2018-7791 is a critical (CVSS 9.8) Improper Authentication vulnerability in schneider electric se modicon m221, all references, all versions prior to firmware v1.6.2.0. EPSS estimates a 1.90% chance of exploitation in the next 30 days, higher than 79.3% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
1.90%
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. 29-08-2018
    PublishedVulnerability first disclosed.
  2. 29-05-2026
    Last modifiedVulnerability information updated.

Description

A Permissions, Privileges, and Access Control vulnerability exists in Schneider Electric's Modicon M221 product (all references, all versions prior to firmware V1.6.2.0). The vulnerability allows unauthorized users to overwrite the original password with their password. If an attacker exploits this vulnerability and overwrite the password, the attacker can upload the original program from the PLC.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.90%

Chance of exploitation in the next 30 days

Percentile

79%

Versus all other CVEs

30-day change

0.00 pp

From 1.90% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.90%

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 electric se1 product
Schneider-electric1 product

2 vendors · 2 products

References

2 links