Vulnerability in Zyxel GS1900-24E firmware

[ Why it matters ]Priority signals

• Urgent advisory from BSI

[ Description ]Official description

An out-of-bounds write vulnerability in the CGI program of Zyxel GS1900-24E firmware versions through 2.90(AAHK.2)C0 could allow an unauthenticated adjacent attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund3 Nov 2026WID-SEC-2026-4330

  Zyxel Switch: Vulnerability allows code execution Translated from German

  Risk criticalCVE-2026-107441

[ References ]References

• www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-out-of-…