A senior executive at cybersecurity firm CrowdStrike apologized at an appearance before a U.S. House of Representatives subcommittee on Tuesday for a faulty software update that caused a global IT outage in July.

Two months on from the global IT outage on 19 July, its full impact is only now becoming apparent. A rogue software update by the US cybersecurity company CrowdStrike crippled up to eight and half million computers using Microsoft systems around the world.

A senior executive at cybersecurity firm CrowdStrike will apologize at an appearance before a U.S. House of Representatives subcommittee on Tuesday for the company's faulty software update that caused a global IT outage in July.

Congress is grilling an executive from CrowdStrike Tuesday about the July outage that disrupted operations for airlines, 911 call centers and other customers worldwide, set off by the cybersecurity firm’s software.

Adam Meyers, a senior vice president with the IT firm at the heart of July's mass outage, faced a grilling by US lawmakers.

A group of House lawmakers Tuesday grilled an executive with cybersecurity firm CrowdStrike, who said the company is “deeply sorry” for causing the global technology outage that grounded thousands of flights and impacted various industries last July.

The July incident underscored how dependent modern commerce and communications have become on just a handful of large technology companies. Travelers were stranded as airlines canceled flights. Emergency services were disrupted as 911 operators found that their systems had failed.

Cancer delays, holidays ruined, businesses out of pocket - the CrowdStrike outage examined.