CVE-2017-6034

Schneider Electric Modicon Modbus Protocol Authentication Bypass by Capture-replay

CRITICAL
9.8
CVSS Score
Published: June 30, 2017 at 02:35 AM UTC
Updated: June 17, 2026 at 01:21 AM UTC
3 products affected across 1 vendorModbus FirmwareModbusElectric Modbus

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Severity
CRITICAL9.8
Exploit prediction
EPSS 5%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
schneider-electric-modbus (same device)
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.8CRITICALCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-294CWE-287

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