What is CVE-2026-0400?

CVE-2026-0400 is a medium-severity vulnerability in Sonicwall Nsa_2700, classified under Use of Externally-Controlled Format String. CVSS score: 4.9/10. Published 2026-02-24.

How severe is CVE-2026-0400?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Vulnerability in Sonicwall Nsa_2700

CVE-2026-0400

A post-authentication Format String vulnerability in SonicOS allows a remote attacker to crash a firewall.

EPSS: 0.004 (34.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.

Affected products

Sonicwall Nsa_2700
Sonicwall Nsa_2800
Sonicwall Nsa_3700
Sonicwall Nsa_3800
Sonicwall Nsa_4700
Sonicwall Nsa_4800
Sonicwall Nsa_5700
Sonicwall Nsa_5800
Sonicwall Nsa_6700
Sonicwall Nssp_10700

Weakness classification (CWE)

CWE-134 — Use of Externally-Controlled Format String

References

PSIRT@sonicwall.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-0400?: CVE-2026-0400 is a medium-severity vulnerability in Sonicwall Nsa_2700, classified under Use of Externally-Controlled Format String. CVSS score: 4.9/10. Published 2026-02-24.
How severe is CVE-2026-0400?: Medium severity. CVSS v3 base score is 4.9 out of 10.