SB2026042987 - Multiple vulnerabilities in SonicOS

Description

This security bulletin contains information about 3 vulnerabilities.

1) Weak Authentication (CVE-ID: CVE-2026-0204)

CWE-ID: CWE-1390 - Weak Authentication

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber

The vulnerability allows a remote attacker to access certain management interface functions.

The vulnerability exists due to weak authentication in the access control mechanism when handling management interface access under specific conditions. A remote attacker can access certain management interface functions to access certain management interface functions.

User interaction is required.

2) Path traversal (CVE-ID: CVE-2026-0205)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to interact with usually restricted services.

The vulnerability exists due to path traversal in SonicOS when handling requests to restricted services. A remote attacker can send a specially crafted HTTP request to interact with usually restricted services.

3) Stack-based buffer overflow (CVE-ID: CVE-2026-0206)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: 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/E:U/U:Clear

The vulnerability allows a remote user to cause a denial of service.

The vulnerability exists due to stack-based buffer overflow in SonicOS when processing crafted input. A remote privileged user can send crafted input to cause a denial of service.

Remediation

Install update from vendor's website.

References

• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2026-0004
• https://www.sonicwall.com/support/notices/security-advisory-firmware-update-required-gen-6-gen-7-and-gen-8-firewalls/kA1VN000001F03x0AC