Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2024-40766

SonicOS

SonicWall / SonicOS · 5.9.2.14-12o and older versions

Watch CVE-2024-40766 Browse KEV feed
Severity
CVSS 9.3 · Critical
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
18.4%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2024-40766 is an unauthenticated vulnerability affecting SonicWall SonicOS. An improper access control vulnerability has been identified in the SonicWall SonicOS management access, potentially leading to...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV. Also confirmed by third-party sources.

Who is affected?

SonicWall / SonicOS 5.9.2.14-12o and older versions.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

SonicOS

An improper access control vulnerability has been identified in the SonicWall SonicOS management access, potentially leading to unauthorized resource access and in specific conditions, causing the firewall to crash.

This issue affects SonicWall Firewall Gen 5 and Gen 6 devices, as well as Gen 7 devices running SonicOS 7.0.1-5035 and older versions.

SonicWall Affected
SonicOS
5.9.2.14-12o and older versions 6.5.4.14-109n and older versions 7.0.1-5035 and older versions
View vendor advisory (opens in new tab)
Published
23 Aug 2024
Exploitation Reported
09 Sep 2024
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

malware ransomware cisa nessus_scanner edge

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 09 Sep 2024

A trusted third party reported exploitation.

Used in malware

CISA

Recorded 09 Sep 2024

Malware families have been linked to exploitation of this CVE.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
CISA First 2024-09-09 00:00 UTC
Tenable Blog 2026-07-15 17:14 UTC
CVE 2026-09-21 20:40 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nessus https://www.tenable.com/plugins/nessus/206801 02 Jun 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

9.3 Critical

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L

EPSS

18.4%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Access Control CWE-284

Recent mention · Tenable Blog

CVE-2026-15409, CVE-2026-15410: SonicWall SMA 1000 zero-day vulnerabilities exploited in the wild

SonicWall patched two recently exploited zero-day vulnerabilities in its SMA 1000 Series secure remote access appliances which may have been chained for unauthenticated remote code execution.Key takeawaysCVE-2026-15409 and CVE-2026-15410 are a pair of exploited vulnerabilities...

Read full advisory

Timeline

From disclosure to observed exploitation

  1. 20:40 UTC

    KEV confirmed by CVE

    Exploitation attested by an external source

  2. 17:14 UTC

    KEV confirmed by Tenable Blog

    Exploitation attested by an external source

  3. 09:26 UTC

    Nessus plugin available

    Scanner coverage available

  4. 00:00 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  5. 00:00 UTC

    First public exploitation report

    Exploit observed in malware

  6. 06:19 UTC

    CVE published

    Vulnerability disclosed publicly

  7. 15:58 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2024-40766

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2024-40766",
  "confidence": "Confirmed",
  "cvss_score": 9.3,
  "cvss_estimated": false,
  "epss_score": 0.18379,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}