Format String Vulnerability in SonicWall Firewall Products
CVE-2026-0400

4.9MEDIUM

Key Information:

Vendor

Sonicwall
Status
Sonicos
Vendor
CVE Published:
24 February 2026

What is CVE-2026-0400?

A Format String vulnerability in SonicOS can be exploited by a remote attacker post-authentication, leading to severe disruptions by crashing the firewall. This issue may allow unauthorized access or denial of service, potentially endangering the entire network. Administrators are urged to review their firewall settings and apply necessary security patches to mitigate risk.

Affected Version(s)

SonicOS Linux 7.0.1-5169 and older versions

SonicOS Linux 7.3.1-7013 and older versions

SonicOS Linux 8.1.0-8017 and older versions

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-202...
vendor-advisory

CVSS V3.1

Score:
4.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Vang3lis and Heuzoo of VARAS@IIE
.