Vulnerability

CVE-2024-40766

Critical· 9.8KEVCVSS9.8EPSS18%

.rules3/5

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.

Threat signal

100/100

Severe

Severity

critical

CVSS

9.8

EPSS

18%

Active

KEV

CISA KEV — actively exploited

Ransomware: Known753d overdue

AffectedSonicWall — SonicOS

Added to KEV

2024-09-09

Federal patch due (BOD 22-01)

2024-09-30

Required action (CISA verbatim)

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Vendor advisory + references

CISA 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.”

CVSS

v3.1via NVDOpen in FIRST calculator →

9.8/ 10CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorNetworkExploitable remotely over the internet — no local access needed.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionNoneFully automated — no victim action needed.
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactHighTotal compromise of integrity — full data modification possible.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

18.4%

probability of exploitation in next 30 days

p97

higher than 97% of all CVEs

10-day trend↑ 0pp

Above the FIRST 'patch on a priority schedule' threshold.

Vendor VEX

No VEX statements published for CVE-2024-40766. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCAct

Active exploitation with total impact on essential/support systems

exploitation: active
automatable: yes
impact: total
mission: support

Lifecycle

2024-08-23Published
2024-09-09Added to CISA KEVransomware: Known
2024-09-30Federal patch due (BOD 22-01)
2026-09-21Last modified2 sources
2026-10-20Vendor advisory · cisa-aaaa26-293a — #StopRansomware: SafePay Ransomware

Entity graph

2 nodes · 1 edges · click to pivot

CVEActorVendor advisoryIOCNews

Vendor advisories

cisa-aaaa26-293a#StopRansomware: SafePay Ransomware

CVE-2024-40766

CISA KEV — actively exploited

CVSS

EPSS

Vendor VEX

Lifecycle

Entity graph

Vendor advisories

References

CVE-2024-40766

CISA KEV — actively exploited

CVSS

EPSS

Vendor VEX

Lifecycle

Entity graph

Vendor advisories

References