Zyxel has released new firmware for 10 GS1900 switch models to fix CVE-2026-107441, an out-of-bounds write that lets an unauthenticated attacker run OS commands on the switch. The flaw sits underneath an exploit that attackers had already used against nearly 1,000 GS1900 switches, and that exploit still works on the firmware Zyxel shipped in June to stop it.
Zyxel GS1900 Zero-Day: Patch 3 Fixes Bypassed Bug
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