Wednesday 4 November
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Zyxel patches zero-day exploited to compromise nearly 1,000 GS1900 network switches

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Sources
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has released a patch for a zero-day vulnerability in its GS1900 series network switches, which was exploited in the wild to compromise nearly 1,000 devices worldwide. Attackers stole configuration files and credentials. The article does not give a CVE identifier or affected firmware versions. Defenders should apply Zyxel's fix to GS1900 switches, review device exposure to the internet, and rotate credentials stored on affected devices.

For security analysts · Written by AI from 1 source · Wrong?

What to do

  1. Apply Zyxel's patch to any GS1900 series network switches you run.
  2. Rotate credentials and review configuration files on switches that may have been exposed.
  3. Check whether GS1900 switches are reachable from the internet and restrict access where possible.

Written by AI from the sources, checked against them

Full story timeline · 1 update

  1. Wed 4 NovemberZyxel fixes zero-day exploited to hack nearly 1,000 network switchesBleepingComputer

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