CVE-2024-40766: SonicWall SonicOS Improper Access Control Vulnerability
Affects SonicWall SonicOSSource CISA KEV
Exploited in the wild · used in ransomware campaigns · KEV due 30 Sep 2024 · 18% EPSS : apply the vendor's fix or mitigations to SonicWall SonicOS now.
Data as of 10/24/2026, 22:16:00 UTC
- Exploitation
Actively exploited – in CISA KEV since 09/09/2024
- KEV deadline
- 09/30/2024 US federal agencies must patch by this date; a sensible deadline for everyone else.
- Ransomware
- Used in ransomware campaigns
- EPSS
- 18.3% chance of exploitation in 30 days – higher than 97% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:LWhat to do
CISA required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Check the firmware or software version for SonicWall SonicOS in the device's admin interface against the vendor advisory.
Description
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.
Weaknesses
- CWE-284Improper Access Control (opens in a new tab)
Pillar weaknessCWE Top 25 (2025): #19OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
References
- psirt.global.sonicwall.com/vuln-detail/SNWLID-2024-0015 (opens in a new tab)
- sonicwall.com/support/notices/gen-7-and-newer-sonicwall-firewalls-sslvpn-recent-threat-activity/kA1VN0000000RDG0A2 (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2024-40766 (opens in a new tab)
- cisa.gov/known-exploited-vulnerabilities-catalog?search=CVE-2024-40766 (opens in a new tab)