(Bloomberg) -- About one-third of targeted attempts to breach corporations’ cyber defenses succeed but three-quarters of executives remain unaccountably confident in their security strategies, Accenture Plc. reported Wednesday in a survey of 2,000 security officers representing large enterprises worldwide.

The “alarmingly high” failure rate in defending against attacks is compounded by their “sheer volume,” Accenture said in the report, titled Building Confidence: Facing the Cybersecurity Conundrum.

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