Zyxel fixes zero-day exploited to hack nearly 1,000 network switches

BleepingComputerNovember 4, 2026Vulnerabilities

MentionsZyxel

Zyxel has patched a zero-day vulnerability in its GS1900 series network switches that hackers exploited to compromise nearly 1,000 devices worldwide and steal configuration files and credentials. [...]

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ConceptZero-dayA flaw attackers exploit before the vendor has a fix: defenders have had zero days to patch.
ConceptExploitCode or a technique that turns a software flaw into something an attacker can actually use.

Zyxel fixes zero-day exploited to hack nearly 1,000 network switches

Explained

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