What is CVE-2024-40766?

CVE-2024-40766 is a critical-severity vulnerability in SonicWall Nsa 2650, classified under Improper Access Control. CVSS score: 9.8/10. Published 2024-08-23.

How severe is CVE-2024-40766?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2024-40766 known to be exploited?

Yes. CVE-2024-40766 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-09-09), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.

Vulnerability in SonicWall Nsa 2650

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.

Published 2024-08-23 · last modified 2026-09-21.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.184 (97.2th percentile), scored 2026-10-19.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.182 · newest: 0.184 · change: +0.002

Affected products

Weakness classification (CWE)

CWE-284 — Improper Access Control

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2024-09-09. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2024-09-30.

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

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0015 (vendor-advisory, Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2024-40766?: CVE-2024-40766 is a critical-severity vulnerability in SonicWall Nsa 2650, classified under Improper Access Control. CVSS score: 9.8/10. Published 2024-08-23.
How severe is CVE-2024-40766?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2024-40766 known to be exploited?: Yes. CVE-2024-40766 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-09-09), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.