CVE-2018-7856
A CWE-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause a possible denial of Service when writing invalid memory blocks to the controller over Modbus.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.58%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A CWE-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause a possible denial of Service when writing invalid memory blocks to the controller over Modbus.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.58% probability · 75th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-754
- Affected
- schneider-electric/modicon premium firmware · schneider-electric/modicon quantum firmware · schneider-electric/modicon m340 firmware · schneider-electric/modicon m580 firmware
- Source
- cybersecurity@se.com
EPSS 1.6% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/Mitigation, Vendor Advisory
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2019-0767Exploit, Third Party Advisory
- https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/Mitigation, Vendor Advisory
- https://www.talosintelligence.com/vulnerability_reports/TALOS-2019-0767Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.