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CVE-2024-40766

9.8, critical Known exploited Used in ransomware

SonicWall SonicOS Improper Access Control Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
18% higher than 97.2% of scored CVEs
Exploitation
Confirmed in the wild
Published
23 Aug 20242 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 9 Sept 2024 and links it to ransomware activity. US federal agencies had to remediate by 30 Sept 2024, a deadline that has passed.

Required action. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

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.

Details

Vendor
SonicWall
Product
SonicOS
Weakness
CWE-284 (opens in a new tab)
Status
Analyzed
Updated
21 Sept 2026
Assigner
PSIRT@sonicwall.com

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

References 2

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other SonicWall CVEs

Every SonicWall CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-83548 SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability KEV EPSS 8% 10, critical
  • CVE-2026-83549 SonicWall SMA1000 Appliances OS Command Injection Vulnerability KEV EPSS 10% 7.8, high
  • CVE-2026-15409 SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability KEV EPSS 7% 10, critical
  • CVE-2026-15410 SonicWall SMA1000 Appliances Code Injection Vulnerability KEV EPSS 12% 7.2, high
  • CVE-2025-40602 SonicWall SMA1000 Missing Authorization Vulnerability KEV EPSS 3% 6.6, medium
  • CVE-2025-23006 SonicWall SMA1000 Appliances Deserialization Vulnerability KEV EPSS 23% 9.8, critical
  • CVE-2024-53704 SonicWall SonicOS SSLVPN Improper Authentication Vulnerability KEV EPSS 95% 9.8, critical
  • CVE-2023-44221 SonicWall SMA100 Appliances OS Command Injection Vulnerability KEV EPSS 76% 7.2, high

Beyond this page

Is CVE-2024-40766 in your network?

This page tells you how dangerous CVE-2024-40766 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2024-40766 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2024-40766 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.