CVE-2024-40766: in the CISA KEV catalogue
SonicWall SonicOS Improper Access Control Vulnerability. CISA added CVE-2024-40766 to the Known Exploited Vulnerabilities catalogue on 2024-09-09 with a default due date of 2024-09-30. Known ransomware campaign use: Known. Forensic triage flag: No.
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. (CISA description)
- Vendor / product
- SonicWall SonicOS
- CWE
- CWE-284
- CISA required action
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- EPSS
- 18%, percentile 97 (scored 2026-11-03)
EPSS puts about 18 in 100 odds (18%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 97% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2024-40766 in the CISA KEV catalogue?
Yes. CISA added CVE-2024-40766 (SonicWall SonicOS Improper Access Control Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2024-09-09. CISA's default due date for it is 2024-09-30.
Is CVE-2024-40766 used in ransomware attacks?
CISA marks known ransomware campaign use as Known for CVE-2024-40766.
What should I do about CVE-2024-40766?
CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2024-40766