CVE DatabaseCVE-2024-40766

Updated 2026-09-21한국어 권고문 →

CVE-2024-407669.8/CRITICALCISA KEVCWE-284

SonicWall SonicOS Management Access Improper Access Control Vulnerability (CVE-2024-40766) Analysis and Mitigation Guide

⚡ Jump to Patch

Affected Vendors

sonicwall

Affected Components

sonicos, sonicwall firewall

Published Date

2024-08-23

CVSS v3.1

9.8

CRITICAL

EPSS (30d)

18.4%

FIRST.org

CISA KEV

Exploited

NVD Source ↗

Executive & SecOps Summary

SECOPS ASSESSMENT

Affected Scope

SonicWall Firewall Gen 5 and Gen 6 devices, and Gen 7 devices running SonicOS 7.0.1-5035 and older versions

Impact

Unauthenticated remote attackers can gain unauthorized access to firewall resources and, under specific conditions, cause the firewall to crash, leading to a Denial of Service (DoS)

Mitigation

Immediately apply the latest firmware patches provided by SonicWall, and restrict or disable WAN management access to the firewall

Affected Products & Version Scope

SonicWall Gen 5 and Gen 6 firewall devices, and Gen 7 devices running SonicOS 7.0.1-5035 and older

Remediation & Live Workaround Commands

PATCH & WORKAROUND

1. Official Patch & Version Upgrade Commands

Upgrade your SonicWall firmware to the patched versions immediately via the SonicWall MySonicWall portal.

Gen 7: Upgrade to SonicOS 7.0.1-5050 or higher
Gen 6: Upgrade to 6.5.4.14-109n or higher
Gen 5: These devices are End-of-Life (EoL); migrate to supported hardware or apply strict workarounds immediately.

2. Temporary Workaround & Hardening Configuration

If patching cannot be applied immediately, disable WAN management access or restrict access to specific, trusted source IP addresses.

bash

# Disabling WAN Management Access via SonicOS CLI
configure terminal
interface X1
  no management https
  no management http
  commit
exit

3. Log Audit & IoC Verification Commands

Configure SonicWall to forward logs to an external Syslog/SIEM server and monitor for unauthorized access attempts.

bash

# Example command to search for unauthorized access attempts in forwarded syslog files
grep -Ei 'Web management login|Unauthorized|Failed connection' /var/log/sonicwall.log

Interactive SecOps Remediation Checklist

0/4 (0%)

Recommended Security Control & Mitigation Partner

NordLayer / Zero-Trust Network Access

CVE-2024-40766 is actively exploited in the wild; immediately restrict WAN-side management access and apply the official firmware updates.

Stop Exposing VPN Ports to the Internet — Switch to Zero-Trust Access

Eliminate public-facing VPN concentrators and firewall management ports with identity-first Zero-Trust Network Access.

90% Attack Surface Reduction · Hardware-Free

Explore Zero-Trust Network Access Plans

Technical Root Cause & Exploitation Mechanics

1. Vulnerability Overview & Root Cause

An improper access control vulnerability (CWE-284) has been identified in the management access interface of SonicWall SonicOS. The root cause lies in the insufficient validation of authorization states within the web management and API endpoints, allowing remote attackers to bypass access control checks without valid credentials.

2. Exploitation Mechanics & Attack Scenario

An attacker can exploit this vulnerability by sending crafted HTTP/HTTPS requests to the exposed SonicOS management interface. This bypasses the authentication layer, granting access to restricted management resources. Under certain conditions, this interaction can trigger memory corruption or process instability, causing the firewall appliance to crash. This vulnerability is actively exploited in the wild (CISA KEV) as an initial entry point for ransomware campaigns.

3. Infrastructure & Business Impact

As firewalls serve as the primary perimeter defense, compromise of the management interface allows attackers to manipulate network policies, extract VPN credentials, or establish persistent backdoors. This can lead to lateral movement within the internal network, resulting in severe data breaches, ransomware deployment, and complete operational disruption.

Official Vendor Advisories & References

NVD Original English 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.

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0015

Source: PSIRT@sonicwall.com · Vendor Advisory

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-40766

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 · US Government Resource

Frequently Asked SecOps Questions (CVE-2024-40766)

FAQ

Q1. How critical is CVE-2024-40766 and is it actively exploited in the wild?

CVE-2024-40766 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 18.4%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.

Q2. Which vendors and products are affected by CVE-2024-40766?

Primary impacted vendors include sonicwall across sonicos, sonicwall firewall. Scope summary: SonicWall Gen 5 and Gen 6 firewall devices, and Gen 7 devices running SonicOS 7.0.1-5035 and older

Q3. What temporary mitigations or workarounds exist for CVE-2024-40766 before patching?

[Mitigation] Immediately apply the latest firmware patches provided by SonicWall, and restrict or disable WAN management access to the firewall Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.

SECOPS WORKBENCH INTEGRATION