CVE-2023-27353: Sonos One Firmware

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

This vulnerability allows network-adjacent attackers to disclose sensitive information on affected installations of Sonos One Speaker 70.3-35220. Authentication is not required to exploit this vulnerability. The specific flaw exists within the msprox endpoint. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root. Was ZDI-CAN-19846.

Affected products

• Sonos One Firmware: version 70.3-35220 only
• Sonos s1: before 11.7.1 (fixed in 11.7.1)
• Sonos s2: before 15.1 (fixed in 15.1)

Published 2023-04-20. Last modified 2026-06-17.