CVE-2019-6830 Schneider Electric CVE debrief

Who should care

OT/ICS operators running Schneider Electric Modicon M580 controllers, plant engineers maintaining EcoStruxure Control Expert projects, and defenders responsible for segmentation and remote-access controls around PLC environments.

Technical summary

The issue is an uncaught-exception condition in Modicon M580 firmware. A carefully timed HTTP request can trigger the fault and cause a denial-of-service condition on the controller. The supplied advisory lists Modicon M580 firmware versions prior to v2.80 as affected and points to firmware SV4.20 or above as the fix, along with project updates in EcoStruxure Control Expert and OT network hardening measures.

Defensive priority

Medium overall, but high priority for any exposed or mission-critical M580 deployment because the impact is controller availability loss in an industrial process.

Recommended defensive actions

• Update Modicon M580 controller firmware to SV4.20 or above, per the vendor remediation.
• Update EcoStruxure Control Expert to v16.0 and set the controller firmware version in the project to match the target device.
• Rebuild and transfer current projects after the firmware upgrade.
• Set an application password in project properties.
• Segment the OT network and use a firewall to block unauthorized access, including port 502/TCP where applicable.
• Review and apply Schneider Electric ACL and secure-communications guidance, including IPsec configuration options described in the vendor documents.
• If using M580 Hot Standby CPUs, use IPsec encrypted communication because CPU memory protection cannot be configured there; otherwise enable CPU memory protection where supported.

Evidence notes

The supplied source corpus ties CVE-2019-6830 to CISA advisory ICSA-25-114-01 and Schneider Electric security notice SEVD-2019-134-11. The advisory description states that an uncaught exception can cause a possible denial of service when an appropriately timed HTTP request is sent to the controller. The source item lists Modicon M580 firmware versions prior to v2.80 as affected and remediation at SV4.20 or above. Timing context: the CVE was published on 2019-05-14 and the advisory was later revised multiple times; the supplied latest modified date is 2026-04-23. No KEV listing is present in the supplied data.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.