CVE-2011-4033: Buffer overflow in the Steema TeeChart ActiveX control, as used in Schneider Electric Vijeo Historian 4.30...

Security readout for executives and security teams

This CVE describes a buffer overflow in a TeeChart ActiveX control used by older Schneider Electric/Citect historian and reporting products. The stated impact is remote denial of service, meaning an exposed affected system could be crashed or disrupted. The public bundle does not provide CVSS scoring, patch details, or active exploitation evidence. Exposure is most likely in legacy industrial reporting or historian environments still running the named Schneider Electric/Citect products at or below the listed versions. Internet exposure would increase business risk, but the bundle does not state whether typical deployments are externally reachable. Prioritize this for environments running the named legacy industrial historian or reporting products, especially where uptime matters. The known impact is denial of service, not confirmed code execution, but disruption to operational reporting can still create business risk. Lack of patch detail in the bundle requires vendor-guided remediation. Mitigation focus: Check Schneider Electric, Citect, and US-CERT guidance for supported fixes or workarounds.; Upgrade or replace affected legacy products according to vendor guidance.; Restrict network access to historian and reporting systems from untrusted networks..

Prepared

Jun 27, 2026, 17:48 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.