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Zyxel GS1900 Patch Fails to Block Zero-Day Exploit Allowing Root Command Execution
Researchers discovered that Zyxel GS1900 switches still vulnerable to a zero‑day exploit despite receiving the vendor’s earlier 2.90 Patch 2 firmware. The flaw, now tracked as CVE‑2026‑107441, allows unauthenticated attackers to execute root‑level commands via the web management interface by exploiting an out‑of‑bounds write. Zyxel released Patch 3 to fix the issue, but the advisory lacks guidance on mitigating already compromised devices. GreyNoise reported 996 switches were targeted, with attackers extracting configurations and credentials.