Exploited CVEs / SonicWall / CVE-2024-40766
CVE-2024-40766
SonicWall SonicOS Improper Access Control Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted, and the vulnerability is known to be used in ransomware campaigns. Federal agencies were required to remediate by 2024-09-30 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: SonicWall PSIRT Advisories, linked below.
Actively exploited SonicWall SonicOS vulnerability, Critical severity, CVSS 9.8. Added to the CISA KEV catalog 2024-09-09.
Risk summary
Updated July 25, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2024-40766
SonicWall SonicOS's improper access control drew ransomware groups within weeks, with confirmed use against SSLVPN-enabled firewalls despite a modest 16% EPSS score. The flaw permits unauthorized resource access and can crash the firewall under certain conditions, and it is rated Critical at CVSS 9.8. It entered KEV on 2024-09-09, and locally managed SonicWall accounts were central to the observed intrusions.
Do this: Patch SonicOS, reset passwords on all local firewall accounts, and enforce MFA for SSLVPN users.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2024-40766
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2024-40766
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
What the press says about CVE-2024-40766
Trusted-source coverage, pulled live from their own feeds.
CISA required action
Federal (BOD 22-01) remediation due date: 2024-09-30 (past due).
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Official fix for CVE-2024-40766
The authoritative fix and affected-version list are published by the vendor. Find the SonicOS advisory on SonicWall PSIRT Advisories.
Common questions about CVE-2024-40766
Is CVE-2024-40766 actively exploited?
Yes. CVE-2024-40766 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2024-09-09, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 18%. CISA also reports it is known to be used in ransomware campaigns.
What is the CISA deadline and required action for CVE-2024-40766?
CISA set the federal (BOD 22-01) remediation due date at 2024-09-30, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
What fixes CVE-2024-40766?
The authoritative fix is in the vendor advisory: see SonicWall PSIRT Advisories for the patched SonicOS versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2024-40766?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2024-40766's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
More exploited SonicWall CVEs
The newest SonicWall entries on the CISA KEV catalog:
All SonicWall exploited CVEs on one page: SonicWall vulnerabilities actively exploited.
Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
