Sonos Arc Ultra

Security Grade

Calculator v1

Sonos Arc Ultra (Arc Ultra)

   Brand: Sonos (Parent: Sonos, Inc.)

   Category: Soundbar (Wi-Fi / Bluetooth / HDMI eARC) • Model / Gen:  Arc Ultra

   Release Date: 2024-10-01 • Status: In sale

   Classification Date: 2026-10-28 • Official Website

Security Evaluation

Criterion	Value	Proof	Comment
Known hardware tampering	Rare	🔗 Proof	Sealed enclosure, no exposed debug or UART header documented; teardown is possible but leaves visible damage.
Known vulnerabilities	Very common	[1] [2] [3] 🔗 Proof	Three CVEs list all S1 and S2 systems before v16.6: SMB2 use-after-free, MPEG-TS parsing RCE and HLS out-of-bounds write, all found through Pwn2Own 2024.
Prior attacks	Rare	🔗 Proof	Public PoC exists from the contest, but no botnet use, no CISA KEV entry and no mass exploitation observed.
Updatability	Very common	🔗 Proof	Automatic OTA; the fix shipped in S2 83.1-61240 and the device checks for updates without user action.
Category Score	Score: 2 / 3

Criterion	Value	Proof	Comment
Authentication with other systems	Partial	🔗 Proof	Cloud and app sessions are paired and authenticated, but local SMB and media handling accept traffic from adjacent hosts without credentials.
Communications	Encrypted with obselete encryption	🔗 Proof	Cloud traffic uses TLS, while local playback and firmware media parsing accept unauthenticated streams on the LAN.
Storage	Encrypted with obselete encryption	🔗 Proof	Configuration and cached media live in flash with no published full-disk encryption; extraction requires physical access.
Category Score	Score: 2 / 3

Criterion	Value	Proof	Comment
Account management	Basic	🔗 Proof	One Sonos account per household with owner and member roles only; no per-device credentials or delegated administration.
Authentication	Basic	🔗 Proof	Pairing authenticates setup, but the media parser is reachable before any authentication check.
Brute-force protection	Basic	🔗 Proof	Account login has basic rate limiting; no documented lockout for repeated local API attempts.
Event logging	Partial logging	🔗 Proof	Playback and app activity is visible in the app; no exportable security log and no syslog on the device.
Passwords	Require change after setup	🔗 Proof	Account password is changeable and supports complexity requirements, but no forced rotation and no per-device secret.
Category Score	Score: 2 / 3

Property	Details
Operating System & App	Sonos OS (Companion App: Sonos App)
Hardware (CPU / GPU)	CPU: • GPU:
Memory & Storage	Memory: • Storage:
Power, Battery & Charging	Battery: • Power: • Charging:
Display & Camera	Display: • Camera:
Sound & Connectivity	Sound: • Connectivity: Wi-Fi 6, Bluetooth 5.3, Ethernet, AirPlay 2
Physical (Dimensions & Mass)	Dimensions: • Mass: