A screenshot of SonicWall's home page. Note the link to the incident disclosure at the top of the page.

Cybersecurity firm SonicWall disclosed Friday night that hackers attacked the company's internal networks by first exploiting a zero-day vulnerability in its very own secure remote access products.

SonicWall announced the hack after being contacted by SC Media about an anonymous tip that the company's systems had undergone a major breach. The company did not respond, but issued a formal announcement later that evening.

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