How severe is CVE-2024-40766?

CVE-2024-40766 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2024-40766 being actively exploited?

Yes. CVE-2024-40766 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2024-09-09, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2024-40766?

CVE-2024-40766 affects Sonicwall Sonicos. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-40766?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2024-40766 have an EU (EUVD) identifier?

Yes. CVE-2024-40766 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-38613. It is also flagged as exploited in the EUVD (since 2024-09-09).

When was CVE-2024-40766 published?

CVE-2024-40766 was published on 2024-08-23 and last updated on 2026-06-17.

CVE-2024-40766

CVE-2024-40766 is a critical-severity vulnerability in Sonicwall Sonicos with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2024-09-09). The underlying weakness is classified as CWE-284.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 16% (96th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2024-09-09)
EU (EUVD) id: EUVD-2024-38613
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2024-09-09)
Weakness: CWE-284
Affected product: Sonicwall Sonicos
Published: 2024-08-23
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2024-40766?: 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.
How severe is CVE-2024-40766?: CVE-2024-40766 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2024-40766 being actively exploited?: Yes. CVE-2024-40766 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2024-09-09, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2024-40766?: CVE-2024-40766 affects Sonicwall Sonicos. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-40766?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2024-40766 have an EU (EUVD) identifier?: Yes. CVE-2024-40766 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-38613. It is also flagged as exploited in the EUVD (since 2024-09-09).
When was CVE-2024-40766 published?: CVE-2024-40766 was published on 2024-08-23 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*

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