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Weekly Signal
Live intelligence Updated 22 Aug 2026 · 21:24 UTC

SonicWall · SonicOS

CVE-2024-40766

SonicWall SonicOS Improper Access Control Vulnerability

Recommended action

Validate affected assets and exposure now, then remediate on an accelerated schedule. SonicWall Security advisory SNWLID 2024 0015

View response plan
CVSS9.8
EPSS18.2%
KEVYes
ExploitationConfirmed exploitation
RemediationNot yet verified ↓

Assessment

Why it matters

CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 18.2%; technical severity is CVSS 9.8.

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.

Who should care

  • Teams operating SonicOS
  • Vulnerability and exposure management teams
  • Security operations teams monitoring exploitation activity

Response plan

What I would do

  1. Confirm whether SonicOS is present in the environment.
  2. Identify affected versions and establish whether vulnerable services are exposed or reachable.
  3. SonicWall Security advisory SNWLID 2024 0015
  4. Review relevant security telemetry for evidence of attempted or successful exploitation.
  5. Document the remediation decision and track it to verified completion.

Treatment intelligence

Remediation intelligence

Not yet verified

Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.

Verification noteAutomated link verification has not completed for this guidance yet.

Technical details

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-284
Affected versions
SonicWall SonicOS (End Excluding 5.9.2.14-13o | End Excluding 6.5.2.8-2n | End Excluding 6.5.4.15.116n | End Including 7.0.1-5035)
Fixed versions
SonicWall SonicOS (Fixed from 5.9.2.14-13o, 6.5.2.8-2n, 6.5.4.15.116n)
Published
23 August 2024
Attack vector
Network
Privileges required
None
User interaction
None

Signal timeline

  1. CVE published
  2. Added to CISA KEV
  3. Latest EPSS score: 18.2%
  4. Signal calculated at 76

External references

Live public intelligence This assessment combines public-source evidence. Validate the affected product, version and exposure against your own environment before making a risk decision.