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.
The record classifies CVE-2024-40766 under weakness class CWE-284. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 797 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.3 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L - EPSS (FIRST)
- 18.3% probability of exploitation in the next 30 days, higher than 97.1% of all scored CVEs
- CISA KEV
- Listed since 2024-09-09, federal remediation deadline 2024-09-30 — used in known ransomware campaigns
- Threadlinqs priority
- 10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
- Published
- 2024-08-23, last modified 2026-09-21
Is CVE-2024-40766 being exploited?
CISA added CVE-2024-40766 to the Known Exploited Vulnerabilities catalog on 2024-09-09, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2024-09-30 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. Weaponised exploit code for CVE-2024-40766 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 57 in the Threadlinqs vulnerability feed.
- trickest/cve (trickest)
Affected products and versions
- SonicWall: SonicOS
How to fix CVE-2024-40766
Because CVE-2024-40766 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2024-09-30. No vendor patch reference has been recorded for CVE-2024-40766 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2024-40766
10 tracked threats in the Threadlinqs corpus reference CVE-2024-40766, either in the campaign’s CVE list or as an indicator on the campaign record.
- ThreatsDay Roundup: AI API Key Leaks (OpenCode Console), PingCAP Source Code Theft, Zeabur Breach, NVIDIA AIStore CVE-2026-65162, Signal CVE-2026-113380, Laravel CVE-2026-114509 — CRITICAL · 2026-10-22
- #StopRansomware: SafePay Ransomware (CISA AA26-293A) — Exploitation of Cisco ASA/FTD, Veeam B&R and SonicWall SonicOS — CRITICAL · 2026-10-20
- Healthcare Sector Ransomware Targeting and Expanding Attack Surface (Qilin, Akira, DragonForce, LockBit, The Gentlemen) — HIGH · 2026-10-09
- The First 24 Hours of a Ransomware Intrusion: Exfiltration, Credential Theft and Backup Targeting (Akira, REDBIKE, AGENDA) — HIGH · 2026-10-03
- Team Cymru Infrastructure Analysis: Seven Active Ransomware Gangs (Akira, DragonForce, Clop, MedusaLocker, Qilin, INC Ransom, Lynx) Abuse Dual-Use Tools and Exploit SonicWall, Gladinet CentreStack, and FortiGate Devices — HIGH · 2026-09-15
- Akira Ransomware Affiliate Forces Windows Safe Mode Reboot to Disable EDR, Exfiltrates Data via AnyDesk/WinRAR/s5cmd but Fails to Encrypt — HIGH · 2026-08-13
- Akira Ransomware Reboots Victims into Safe Mode to Blind EDR and Windows Defender — HIGH · 2026-08-12
- SEO Poisoning Supply Chain Campaign Distributing Akira Ransomware via Trojanized Enterprise Software — CRITICAL · 2026-06-30
- Akira Ransomware Kill Chain — SSLVPN Credential Stuffing → Kerberoasting → RDP Lateral → vssadmin Shadow Copy Deletion (SANS ISC Forensic Reconstruction, May 2026) — HIGH · 2026-05-27
- Coordinated Reconnaissance Campaign Maps SonicWall SSL VPN Attack Surface via Commercial Proxy Infrastructure (84,142 Sessions / 4,305 IPs / 20 ASNs) — HIGH · 2026-02-25
Sources
Enriched from CVE.org, FIRST EPSS, CISA KEV, public proof-of-concept repositories. Last verified by Threadlinqs on .