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Vulnerability record · CVE-2017-6034 · published 30 June 2017

CVE-2017-6034: Schneider-electric modbus firmware authentication bypass by capture-replay vulnerability

Schneider Electric · Modbus Firmware

An authentication bypass by capture-replay issue was discovered in Schneider Electric Modicon Modbus Protocol. Sensitive information is transmitted in cleartext in the Modicon Modbus protocol, which may allow an attacker to replay the following commands: run, stop, upload, and download.

9.8 CVSS 3.1 Critical EPSS 5.2% · top 7.8% CWE-294 · Authentication bypass by capture-replayCWE-287 · Improper authentication
9.8CVSS 3.1 base score, v2 7.5
5.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

An authentication bypass by capture-replay issue was discovered in Schneider Electric Modicon Modbus Protocol. Sensitive information is transmitted in cleartext in the Modicon Modbus protocol, which may allow an attacker to replay the following commands: run, stop, upload, and download.

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

Affected products

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

References

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

Source: NIST National Vulnerability Database (record CVE-2017-6034), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.