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CVE-2024-40766

SonicWall SonicOS Improper Access Control

9.8 CRITICALActively exploited (CISA KEV)Used in ransomwareEPSS 18.4%
  1. Published23 Aug 2024
  2. Added to CISA KEV9 Sept 2024
  3. Remediation due30 Sept 2024
Actively exploited (CISA KEV)

SonicWall SonicOS contains an improper access control vulnerability that could lead to unauthorized resource access and, under certain conditions, may cause the firewall to crash.

Added to KEV: 9 Sept 2024Federal remediation due: 30 Sept 2024Used in ransomware

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

SonicWall Sonicos≤ 7.0.1-5035 · < 5.9.2.14-13o · < 6.5.2.8-2n · < 6.5.4.15.116n

Remediation

Fixed in
SonicWall Sonicos≥ 5.9.2.14-13o

References

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Frequently asked

Is CVE-2024-40766 being actively exploited?

Yes. CVE-2024-40766 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 9 Sept 2024. It has been used in ransomware campaigns.

How severe is CVE-2024-40766?

CVE-2024-40766 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 18.4% probability of exploitation.

Which products are affected by CVE-2024-40766?

Affected products include SonicWall Sonicos.

How do I fix CVE-2024-40766?

Upgrade affected software to a fixed version, for example SonicWall Sonicos 5.9.2.14-13o or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2024-40766 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.