Schneider Electric Modicon Modbus Protocol Authentication Bypass by Capture-replay
Priority MEDIUM 57CWE-294Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-294.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.056 92nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Schneider Electric | Modicon Modbus Protocol | all versions | — | No fix listed | CNA |
- Modicon Modbus Protocol VendorSchneider Electric Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:schneider-electric:modbus_firmware:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Schneider Electric |
| cpe:2.3:h:schneider-electric:modbus:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Schneider Electric |
- cpe:2.3:o:schneider-electric:modbus_firmware:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Schneider Electric
- cpe:2.3:h:schneider-electric:modbus:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Schneider Electric
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2017-6034
- 2026-10-03 Alias added: GHSA-m8hv-35c9-8jrx
References
More Schneider Electric Modbus Firmware vulnerabilities
- TI-2017-03942 A Violation of Secure Design Principles issue was discovered in Schneider Electric… CVSS 3.0MEDIUM 5.3
Sources
- CVE-2017-6034 · CVE Program
- CVE-2017-6034 · NVD
- FIRST EPSS
- GHSA-m8hv-35c9-8jrx · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences