What is CVE-2026-3439?

CVE-2026-3439 is a medium-severity vulnerability in Sonicwall Nsa_2700, classified under Stack-based Buffer Overflow. CVSS score: 4.9/10. Published 2026-03-04.

How severe is CVE-2026-3439?

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

Buffer overflow in Sonicwall Nsa_2700

CVE-2026-3439

A post-authentication Stack-based Buffer Overflow vulnerability in SonicOS certificate handling allows a remote attacker to crash a firewall.

Vulnerability class: Buffer Overflow

EPSS: 0.003 (17.4th 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-121 — Stack-based Buffer Overflow

References

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

Frequently asked questions

What is CVE-2026-3439?: CVE-2026-3439 is a medium-severity vulnerability in Sonicwall Nsa_2700, classified under Stack-based Buffer Overflow. CVSS score: 4.9/10. Published 2026-03-04.
How severe is CVE-2026-3439?: Medium severity. CVSS v3 base score is 4.9 out of 10.