CVE-2021-31505: Arlo Q Plus Firmware

Medium severity, CVSS 6.8. EPSS: 0.6% chance of exploitation in the next 30 days.

This vulnerability allows attackers with physical access to escalate privileges on affected installations of Arlo Q Plus 1.9.0.3_278. Authentication is not required to exploit this vulnerability. The specific flaw exists within the SSH service. The device can be booted into a special operation mode where hard-coded credentials are accepted for SSH authentication. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of root. Was ZDI-CAN-12890.

Affected products

• Arlo Q Plus Firmware: version 1.9.0.3_278 only

Published 2021-06-29. Last modified 2026-06-17.