CVE-2019-6856
HIGHCVSS 7.5/10EPSS 1.63%
Last modified
CVE-2019-6856 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) which could cause a Denial of Service when writing specific physical memory blocks using Modbus TCP.. EPSS estimates a 1.63% chance of exploitation in the next 30 days.
Description
A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) which could cause a Denial of Service when writing specific physical memory blocks using Modbus TCP.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Schneider-Electric | Modicon M580 Firmware | < 2.80 |
| Schneider-Electric | Modicon M340 Firmware | < 3.01 |
| Schneider-Electric | Tsxh5744m Firmware | < 3.20 |
| Schneider-Electric | Tsxh5724m Firmware | < 3.20 |
| Schneider-Electric | Tsxp576634m Firmware | < 3.20 |
| Schneider-Electric | Tsxp57554m Firmware | < 3.20 |
| Schneider-Electric | Tsxp575634m Firmware | < 3.20 |
| Schneider-Electric | Tsxp57454m Firmware | < 3.20 |
| Schneider-Electric | Tsxp574634m Firmware | < 3.20 |
| Schneider-Electric | Tsxp57354m Firmware | < 3.20 |
| Schneider-Electric | Tsxp573634m Firmware | < 3.20 |
| Schneider-Electric | Tsxp57304m Firmware | < 3.20 |
| Schneider-Electric | Tsxp57254m Firmware | < 3.20 |
| Schneider-Electric | Tsxp572634m Firmware | < 3.20 |
| Schneider-Electric | Tsxp57204m Firmware | < 3.20 |
| Schneider-Electric | Tsxp571634m Firmware | < 3.20 |
| Schneider-Electric | Tsxp57154m Firmware | < 3.20 |
| Schneider-Electric | Tsxp57104m Firmware | < 3.20 |
| Schneider-Electric | 140cpu65150 Firmware | < 3.52 |
| Schneider-Electric | 140cpu65160 Firmware | < 3.52 |
| Schneider-Electric | 140cpu65260 Firmware | < 3.52 |
| Schneider-Electric | 140cpu67261 Firmware | < 3.52 |
| Schneider-Electric | 140cpu67060 Firmware | < 3.52 |
| Schneider-Electric | 140cpu67160 Firmware | < 3.52 |
| Schneider-Electric | 140cpu67260 Firmware | < 3.52 |
| Schneider-Electric | 140cpu65860 Firmware | < 3.52 |
| Schneider-Electric | 140cpu67861 Firmware | < 3.52 |
| Schneider-Electric | 140cpu65160s Firmware | < 3.52 |
| Schneider-Electric | 140cpu67160s Firmware | < 3.52 |
References
- https://www.se.com/ww/en/download/document/SEVD-2019-344-01Vendor Advisory
- https://www.us-cert.gov/ics/advisories/icsa-20-016-01Third Party Advisory, US Government Resource
- https://www.se.com/ww/en/download/document/SEVD-2019-344-01Vendor Advisory
- https://www.us-cert.gov/ics/advisories/icsa-20-016-01Third Party Advisory, US Government Resource
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-6856?
A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in Modicon M580, Modicon M340, Modicon Quantum, Modicon Premium (see security notification for specific versions) which could cause a Denial of Service when writing specific physical memory blocks using Modbus TCP.
How severe is CVE-2019-6856?
CVE-2019-6856 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.63% probability of exploitation in the next 30 days.
How do I fix CVE-2019-6856?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2019-6856?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST