Stack-based buffer overflow in SonicOS - CVE-2026-0399
Published: February 24, 2026
Vulnerability identifier: #VU123196
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-0399
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to perform a denial of service attack.
The vulnerability exists due to a boundary error. A remote privileged user can send specially crafted data to the device, trigger a stack-based buffer overflow and perform a denial of service attack.
Affected software
SonicOS
How to mitigate CVE-2026-0399
Install updates from vendor's website.
SonicOS - addressed in versions 7.3.2-7010, 8.2.0-8009