Zyxel security advisory for privilege escalation vulnerability in GS1900 series switches

CVE: CVE-2022-45853

Zyxel has released patches for GS1900 series switches affected by a privilege escalation vulnerability. Users are advised to install them for optimal protection.

What is the vulnerability?

The privilege escalation vulnerability in the Zyxel GS1900 series switches could allow a local authenticated attacker with administrator privileges to execute some system commands as the “root” user on a vulnerable device via SSH. Although SSH access is disabled by default, which would make a network immune from the attack, users are still recommended to upgrade to the latest firmware for optimal protection.

What versions are vulnerable—and what should you do?

After a thorough investigation, we’ve identified the vulnerable switches that are within their vulnerability support period and released patches to address the vulnerability, as shown in the table below.

Affected model Affected version Patch availability
GS1900-8 V2.70(AAHH.3) V2.70(AAHH.5)
GS1900-8HP V2.70(AAHI.3) V2.70(AAHI.5)
GS1900-10HP V2.70(AAZI.3) V2.70(AAZI.5)
GS1900-16 V2.70(AAHJ.3) V2.70(AAHJ.5)
GS1900-24 V2.70(AAHL.3) V2.70(AAHL.5)
GS1900-24E V2.70(AAHK.3) V2.70(AAHK.5)
GS1900-24EP V2.70(ABTO.3) V2.70(ABTO.5)
GS1900-24HPv2 V2.70(ABTP.3) V2.70(ABTP.5)
GS1900-48 V2.70(AAHN.3) V2.70(AAHN.5)
GS1900-48HPv2 V2.70(ABTQ.3) V2.70(ABTQ.5)
Got a question?

Please contact your local service rep or visit Zyxel’s Community for further information or assistance.


Thanks to Justin Aarden for reporting the issue to us.

Revision history

2023-6-6: Initial release.