CVE-2024-40766: SonicWall SonicOS Improper Access Control Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 9 Sep 2024, 17 days after the CVE record was published.

How likely is exploitation in the next 30 days?

18.4%

EPSS score, percentile 97.2 of all scored records

How severe?

9.3 Critical

CVSS v3.1 base score, from CISA's enrichment of the record

What should I do?

Required action (CISA), due 30 Sep 2024: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Advisories and patches (1)

Which versions are affected?

Affected: 5.9.2.14-12o and older versions; 6.5.4.14-109n and older versions; 7.0.1-5035 and older versions

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

CISA due date for this action: 30 September 2024.

Advisories and patches

• psirt.global.sonicwall.com (Vendor advisory)

Linked from CISA's catalog entry

• https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0015
• https://www.sonicwall.com/support/notices/gen-7-and-newer-sonicwall-firewalls-sslvpn-recent-threat-activity/kA1VN0000000RDG0A2
• https://nvd.nist.gov/vuln/detail/CVE-2024-40766

Affected products and versions

As listed in the CVE record.

Versions not listed are: unknown.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

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.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

• CISA added CVE-2024-40766 to its Known Exploited Vulnerabilities (KEV) catalog on 9 Sep 2024.
• CISA marks it as known to be used in ransomware campaigns.
• The due date CISA sets for the required action is 30 Sep 2024.
• The CVE record was published on 23 Aug 2024, 17 days before it was added to KEV.
• The CVE record carries a CVSS v3.1 base score of 9.3 (Critical), taken from CISA's enrichment of the record.
• FIRST's EPSS model puts the probability of exploitation in the next 30 days at 18.4% (percentile 97.2), as of 28 Oct 2026.
• CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact partial.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

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.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

• CWE-284: Improper Access Control

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

More exploited SonicWall vulnerabilities

• CVE-2026-83548: SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability (added 2 Sep 2026)
• CVE-2026-83549: SonicWall SMA1000 Appliances OS Command Injection Vulnerability (added 2 Sep 2026)
• CVE-2026-15409: SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability (added 14 Jul 2026)
• CVE-2026-15410: SonicWall SMA1000 Appliances Code Injection Vulnerability (added 14 Jul 2026)
• CVE-2025-40602: SonicWall SMA1000 Missing Authorization Vulnerability (added 17 Dec 2025)
• CVE-2023-44221: SonicWall SMA100 Appliances OS Command Injection Vulnerability (added 1 May 2025)