Zyxel patches a zero-day hiding behind an old fix

Zyxel has patched a zero-day vulnerability that attackers exploited to compromise 996 GS1900 network switches across 48 countries, exposing device configurations, network information and hashed root credentials. The attack began around August 17, according to cybersecurity firm GreyNoise, but researchers initially blamed a different vulnerability that Zyxel had already addressed. The newly identified flaw, tracked as…

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