CVE-2026-3439Network attack vector

Authenticated firewall crash via certificate handling overflow

Published Mar 4, 2026 · Updated Mar 4, 2026

Stack-based buffer overflow in SonicWall SonicOS 7.0.1-5169 and earlier allows remote authenticated users to crash the firewall. SonicWall identifies certificate handling as the affected component but has not disclosed the specific handler or operation that overruns the stack buffer. Administrative privileges are required; successful exploitation interrupts service without reported data disclosure or modification.

CVSS severity4.9
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in SonicWall SonicOS 7.0.1-5169 and earlier allows remote authenticated users to crash the firewall. SonicWall identifies certificate handling as the affected component but has not disclosed the specific handler or operation that overruns the stack buffer. Administrative privileges are required; successful exploitation interrupts service without reported data disclosure or modification.

The record

CVE
CVE-2026-3439
Published
Mar 4, 2026
Updated
Mar 4, 2026
Vendor
SonicWall
Product
SonicOS
Classifications
CWE-121, T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.0.1-5169 and older versions
  2. Affected versionversion=7.3.1-7013 and older versions
  3. Affected versionversion=8.1.0-8017 and older versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

SonicWall · SonicOSversion=7.0.1-5169 and older versions; version=7.3.1-7013 and older versions; version=8.1.0-8017 and older versions

Published CVSS scores

4.9CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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