# SonicWall SonicOS Improper Access Control · pwn.watch

> SonicWall SonicOS contains an improper access control vulnerability that could lead to unauthorized resource access and, under certain conditions, may cause the firewall to crash. Added to the CISA KEV catalog on 2024-09-09. CISA lists known use in ransomware campaigns.

Page: https://pwn.watch/i/sonicwall-sonicos-cve-2024-40766 · generated 2026-10-22T22:00:08.805Z

## Status
- Severity: critical · status: closed · patch: patched
- Product: SonicWall SonicOS
- Started: 2024-08-23 · closed: 2024-09-09
- CVEs: CVE-2024-40766
- Affected: See vendor advisory (versions are not listed in the KEV record)
- Fixed in: See vendor advisory linked in sources

## Follow this incident
- RSS (one item per update): https://pwn.watch/i/sonicwall-sonicos-cve-2024-40766/feed.xml
- JSON Feed: https://pwn.watch/i/sonicwall-sonicos-cve-2024-40766/feed.json
- Full data (timeline, sources, posts, agentBrief): https://pwn.watch/i/sonicwall-sonicos-cve-2024-40766.json
- This file: https://pwn.watch/i/sonicwall-sonicos-cve-2024-40766/llms.txt

## Updates (newest first)
- 2024-09-09: CISA added CVE-2024-40766 to the KEV catalog (federal deadline 2024-09-30) (https://www.cisa.gov/known-exploited-vulnerabilities-catalog)
- 2024-08-23: CVE-2024-40766 published (https://nvd.nist.gov/vuln/detail/CVE-2024-40766)

## Fix brief
# Security brief: SonicWall SonicOS Improper Access Control

Source: https://pwn.watch/i/sonicwall-sonicos-cve-2024-40766 · status: closed (closed Sep 9, 2024) · severity: critical · updated Sep 9, 2024

## Patch status
**PATCHED: fixed releases exist. Upgrade to a fixed version.**

## What it is
SonicWall SonicOS contains an improper access control vulnerability that could lead to unauthorized resource access and, under certain conditions, may cause the firewall to crash. Added to the CISA KEV catalog on 2024-09-09. CISA lists known use in ransomware campaigns.

Severity detail: CVSS 9.3 (v3.1, CISA-ADP), actively exploited (CISA KEV); known ransomware use

- Product: SonicWall SonicOS
- CVE / advisory ids: CVE-2024-40766

## Affected versions
- See vendor advisory (versions are not listed in the KEV record)

## Check whether you're affected
No generic command applies (the product is a hosted service, appliance or desktop app). Check the installed version in its admin UI / About screen and compare with the versions above.

## Fix
Upgrade to one of these fixed versions (or later on the same branch):
- See vendor advisory linked in sources

After upgrading, re-run the checks above and redeploy/restart the affected services.

## Latest updates
- Sep 9, 2024: CISA added CVE-2024-40766 to the KEV catalog (federal deadline 2024-09-30)
- Aug 23, 2024: CVE-2024-40766 published

## Advisories
- [SonicWall advisory: CVE-2024-40766](https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0015) (SonicWall)
- [SonicWall advisory: CVE-2024-40766](https://www.sonicwall.com/support/notices/gen-7-and-newer-sonicwall-firewalls-sslvpn-recent-threat-activity/kA1VN0000000RDG0A2) (SonicWall)
- [NVD: CVE-2024-40766](https://nvd.nist.gov/vuln/detail/CVE-2024-40766) (NVD)
- [CISA Known Exploited Vulnerabilities Catalog](https://www.cisa.gov/known-exploited-vulnerabilities-catalog) (CISA)

## Caveats
Derived from the CISA KEV JSON feed (catalogVersion 2026.10.21); CVSS from the CVE record (cveawg.mitre.org). startedAt is the CVE publication date when it fell in 2024 before the KEV listing, else the KEV dateAdded; exploitation may have begun earlier. closedAt is the KEV listing date (a fix or mitigation was available then unless noted).

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Machine-readable: https://pwn.watch/i/sonicwall-sonicos-cve-2024-40766.json · all incidents: https://pwn.watch/incidents.json. Verify against the vendor advisory before changing production systems.