Buffer overflow in Sonos Era 300
CVE-2026-4149
Sonos Era 300 SMB Response Out-Of-Bounds Access Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Sonos Era 300. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of the DataOffset field within SMB responses. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the kernel. Was ZDI-CAN-28345.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.011 (64.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.011 · change: +0.001
Affected products
- Sonos Era 300 — versions 17.5 (build 91.0-70070)
- Sonos Era 300
- Sonos Era 300 Firmware
Weakness classification (CWE)
References
- www.zerodayinitiative.com/advisories/ZDI-26-192/ (x_research-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-4149?
- CVE-2026-4149 is a critical-severity vulnerability in Sonos Era 300, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 9.8/10. Published 2026-04-11.
- How severe is CVE-2026-4149?
- Critical severity. CVSS v3 base score is 9.8 out of 10.