CVE-2017-6034: Schneider Electric Modicon Modbus Protocol Authentication Bypass by Capture-replay
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.
Security readout for executives and security teams
This is a serious industrial-control weakness in Schneider Electric Modicon Modbus Protocol. Because sensitive protocol information is sent in cleartext, an attacker who can capture valid traffic may replay commands such as run, stop, upload, and download. That could affect operations, data confidentiality, and controller availability. Exposure is most relevant where Modicon Modbus traffic is reachable by untrusted users or networks, especially where traffic can be observed. The source data does not identify specific device models, deployment prerequisites, or compensating controls. Prioritize this for industrial environments using Schneider Modicon Modbus. The potential impact includes unauthorized operational commands and data transfer. Urgency is highest where Modbus traffic crosses exposed or poorly segmented networks. Mitigation focus: Review Schneider advisory SEVD-2017-065-01 for official remediation or compensating controls.; Review CISA ICSA-17-101-01 for vendor-coordinated guidance.; Limit Modicon Modbus access to trusted, authorized networks during assessment..
Prepared
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Potential ATT&CK relevance
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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cwe · low confidence lookup
CWE-294: Exact CWE lookup
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The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
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1CVSS vectors
3Timeline events
2ADP providers
4Source links
SSVC decision data
CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: total
CVSS vector scores
1 official score
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CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
CWE-294 · source CWE mapping
Authentication Bypass by Capture-replay
Authentication Bypass by Capture-replay represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.