---
title: "CVE-2024-40766: SonicWall SonicOS Improper Access Control Vulnerability"
url: https://erroneo.us/security/cve/CVE-2024-40766/
description: "CVE-2024-40766 (SonicWall SonicOS): Exploited in the wild (CISA KEV). An improper access control vulnerability has been identified in the SonicWall SonicOS…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-08-23
date_modified: 2026-09-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-40766"
kev: true
cvss: 9.3
epss: 0.18379
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2024-40766: SonicWall SonicOS Improper Access Control Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run SonicWall SonicOS. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-09-09, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-09-30 ; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns .
- EPSS 18.4% , percentile 97: FIRST’s model estimates a 18.4% chance of exploitation activity in the next 30 days, higher than 97% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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.

## Affected products (CVE record)

- SonicWall SonicOS: 5.9.2.14-12o and older versions, 6.5.4.14-109n and older versions, 7.0.1-5035 and older versions

## Severity

- CISA-ADP CVSS 3.1: 9.3 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:L`

## Exploitation

- CISA KEV: added 2024-09-09; federal due date 2024-09-30. Known ransomware use: Known.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 18.38% probability of exploitation activity in the next 30 days; percentile 97.

## Sources

- [psirt.global.sonicwall.com](https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0015)
- [Listed in CISA KEV notes (sonicwall.com)](https://www.sonicwall.com/support/notices/gen-7-and-newer-sonicwall-firewalls-sslvpn-recent-threat-activity/kA1VN0000000RDG0A2)
- [CVE.org record CVE-2024-40766](https://www.cve.org/CVERecord?id=CVE-2024-40766)
- [NVD entry CVE-2024-40766](https://nvd.nist.gov/vuln/detail/CVE-2024-40766)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-40766)

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Source page: https://erroneo.us/security/cve/CVE-2024-40766/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt