Background exploitation KEV catalog Ransomware No authentication

CVE-2024-40766

SonicWall SonicOS Improper Access Control Vulnerability

CheckOps priority index

7.3/10 Patch within 7 days

Severity9.3

Probability1.8

Exploitation5/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 18.4% higher than 97.2% of CVEs

CVSS 3.1 9.3 AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:

Exploited for 785 days 09 Sept 2024

CISA due date 30 Sept 2024 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 5 / 5

KEV catalog (CISA)09 Sept 2024
Exploited in EUVD (ENISA)09 Sept 2024
Used by ransomwareyes
EPSS above 10 %18.4%
No account, over the networkyes

What to do

Fix

Apply the vendor’s fix as soon as it is available.

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

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

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.

Affected products

SonicOS

Affected versions

7.0.1-5035 and older versions
5.9.2.14-12o and older versions
6.5.4.14-109n and older versions

Weaknesses (CWE)

CWE-284

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

23 Aug 2024
Published
09 Sept 2024
Exploitation reported (ENISA)
09 Sept 2024
Added to the KEV catalog
30 Sept 2024
CISA remediation due date
25 Sept 2026
EPSS peak: 18.4%

References

Other exploited vulnerabilities from the same vendor

CVE-2026-83549SonicWall SMA1000 Appliances OS Command Injection Vulnerability
4.6 · Actively exploited
CVE-2026-83548SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability
6.0 · Actively exploited
CVE-2026-15410SonicWall SMA1000 Appliances Code Injection Vulnerability
5.6 · Actively exploited
CVE-2026-15409SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerability
6.6 · Actively exploited
CVE-2025-40602SonicWall SMA1000 Missing Authorization Vulnerability
3.9 · Background exploitation
CVE-2023-44221SonicWall SMA100 Appliances OS Command Injection Vulnerability
7.0 · Background exploitation