SonicWall SonicOS Improper Access Control Vulnerability
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.
- Vendor
- SonicWall
- Product
- SonicOS
- CVSS
- 9.8
- EPSS (exploit probability)
- 18.4%
- Status
- kevransomware use
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2024-40766 being exploited?
Yes. CISA added CVE-2024-40766 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild. CISA marks it as known to be used in ransomware campaigns.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 18.4% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-10-21. Full cross-catalog view: /kev-comparison
What to do
CISA required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
US federal civilian agencies must remediate by (21 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other SonicWall SonicOS CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2024-53704 SonicWall SonicOS SSLVPN Improper Authentication Vulnerabilityransomware use | [ CRITICAL ] | 9.8 | 95.3% | |
| CVE-2020-5135 SonicWall SonicOS Buffer Overflow Vulnerabilityransomware use | [ CRITICAL ] | 9.8 | 26.9% |