Cyber Resilience

CVE-2026-3439

Medium

Published: 04 March 2026

Published
04 March 2026
Modified
05 March 2026
KEV Added
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Patch
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CVSS Score v3.1 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0014 34.1th percentile
Risk Priority 10 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-3439 is a medium-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Sonicwall Sonicos. Its CVSS base score is 4.9 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 34.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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

CWE(s)
CWE-121

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1499.004 Application or System Exploitation Impact
Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.
attack.mitre.org →
Why these techniques?

Post-auth stack buffer overflow (CWE-121) in firewall cert handling directly enables application/system exploitation to produce DoS/crash (T1499.004).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

Affected Assets

sonicwall
sonicos
≤ 7.3.2-7010 · ≤ 8.2.0-8009

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References