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Full vulnerability report · 2024
CVE-2024-40766High confidence

SonicWall SonicOS Improper Access Control Vulnerability

SonicWall · SonicOS

9.8CriticalCVSS 3.1
Recommended action
Patch now

CISA confirms exploitation in the wild and lists 2024-09-30 as the remediation due date.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityCriticalOperational priority:Critical, unchanged from published severity.unchanged

Evidence used

  • CISA confirms exploitation in the wild.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 18.38% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs SonicWall SonicOS and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 3 daysRemediation target: Within 90 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2024-38613

CISA KEV mirrored by ENISA

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.

EUVD state
Present in the current official mapping
Known exploitation
Recorded by ENISA since 9 Sep 2024. Evidence sources: cisa_kev.
ENISA score
9.3 · CVSS 3.1
Advisory evidence
2 linked advisory records
Explicit mitigation evidence

Only statements that explicitly mention a fix, patch, update, workaround or mitigation are shown here.

  • csaf_ncscnl · NCSC-2024-0353Kwetsbaarheid verholpen in Sonicwall SonicOS
Recommended actionPatch now

CISA confirms exploitation in the wild and lists 2024-09-30 as the remediation due date.

Patch available
01

What, why and how

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.

What

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.

Why

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

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.

Why

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Confirmed in the wild

CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2024-09-09. Known ransomware campaign use is recorded.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Improper Access Control → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-284 ↗

CWE-284: Improper Access Control. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-284CISA KEV
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2024-38613Known-exploited evidence recorded

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.

Official EUVD record ↗
BSI · German · WID-SEC-2024-1906SonicWall SonicOS: Schwachstelle ermöglicht Offenlegung von Informationen und Denial of Service

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in SonicWall SonicOS ausnutzen, um Informationen offenzulegen und um einen Denial of Service Angriff durchzuführen.

Official advisory ↗
Canadian Centre for Cyber Security · English · AL25-010SSL VPN vulnerability impacting Gen 7 SonicWall Firewalls (CVE-2024-40766) – Update 1

An Alert is used to raise awareness of a recently identified cyber threat that may impact cyber information assets, and to provide additional detection and mitigation advice to recipients. The Canadian Centre for Cyber Security ("Cyber Centre") is also available to provide additional assistance regarding the content of this Alert to recipients as requested.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20240828Security Bulletin 28 Aug 2024

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 28 Aug 2024, published on 28 August 2024. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0712Vulnérabilité dans les produits Sonicwall

Une vulnérabilité a été découverte dans les produits Sonicwall. Elle permet à un attaquant de provoquer un déni de service à distance, une atteinte à la confidentialité des données et un contournement de la politique de sécurité.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2024-007899SonicWALL の SonicOS における脆弱性

SonicWALL の SonicOS には、不特定の脆弱性が存在します。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6284SonicWall 제품 보안 업데이트 권고

SonicWall의 SonicOS에서 발생하는 부적절한 접근 제어 취약점(CVE-2024-40766) [1][2]

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6282美 CISA 발표 주요 Exploit 정보공유(Update. 2024-09-09)

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.

Official advisory ↗
NCSC-NL · Dutch · NCSC-2024-0353Kwetsbaarheid verholpen in Sonicwall SonicOS

De kwetsbaarheid bevindt zich in de management interface en de SSLVPN en stelt een kwaadwillende in staat om een Denial-of-Service te veroorzaken en mogelijk toegang te krijgen tot systeemgegevens en deze aan te passen. Van betrouwbare partners ontvangt het NCSC signalen dat ransomware groepen zich al langere tijd specifiek concentreren op kwetsbaarheden in SonicOS-systemen en dat deze kwetsbaarheid misbruikt lijkt te worden om toegang te krijgen tot de infrastructuur en ransomware uit te rollen. Indicaties geven aan dat de kwetsbaarheid wordt misbruikt via de SSLVPN, waarbij met name lokale accounts worden gecompromitteerd, indien tweefactor-authenticatie (MFA) niet in gebruik is.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
SonicOS: 7.0.1-5035 and older versions, 5.9.2.14-12o and older versions, 6.5.4.14-109n and older versions
Fixed
Update firmware to version 7.3.0 Reset all local user account passwords for any accounts with SSL VPN access, especially if they were carried over during migration from Gen 6 to Gen 7 Continue applying the previously recommended best practices: Enable Botnet Protection and Geo-IP Filtering Remove unused or inactive user accounts Enforce MFA and strong password policies The Cyber Centre recommends that organizations: Assess the installations of SonicWall Firewalls Apply updates to SonicWall Firewalls without delay Monitor the vendor security KB for updated guidance Footnote 3 In addition, the Cyber Centre strongly recommends that organizations review and implement the Cyber Centre's Top 10 IT Security Actions Footnote 4 with an emphasis on the following strategies: Consolidate, monitor, and defend internet gateways Patch operating systems and applications Isolate web-facing applications Implement application allow lists Review the Cyber Centre's Playbook on Ransomware (ITSM.00.099) and apply recommended security controls Footnote 5 . If activity matching the content of this alert is discovered, recipients are encouraged to report via the My Cyber Portal , or email contact@cyber.gc.ca .
Action
Apply the fixed release for the affected product branch as recorded by Canadian Centre for Cyber Security. Validate the exact product and build in the linked advisory before deployment.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 23 Aug 2024 · Last source change 21 Sept 2026, 20:25 UTC · CWE-284 · Improper Access Control

CVE recordCVE.org · 5.2
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2024-38613
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Vendor guidanceAuthoritative vendor guidance changed: removed remediation: cyber.gc.ca/potential-ssl-vpn-zero-day-vulnerability-impacting-gen-7-sonicwall-firewalls.
    Before
    remediation: cyber.gc.ca/potential-ssl-vpn-zero-day-vulnerability-impacting-gen-7-sonicwall-firewalls · vendor advisory: psirt.global.sonicwall.com/SNWLID-2024-0015
    After
    vendor advisory: psirt.global.sonicwall.com/SNWLID-2024-0015
    PSIRT@sonicwall.com ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    SonicOS: 5.9.2.14-12o and older versions, 6.5.4.14-109n and older versions, 7.0.1-5035 and older versions · Fixed: Update firmware to version 7.3.0 Reset all local user account passwords for any accounts with SSL VPN access, especially if they were carried over during migration from Gen 6 to Gen 7 Continue applying the previously recommended best practices: Enable Botnet Protection and Geo-IP Filtering Remove unused or inactive user accounts Enforce MFA and strong password policies The Cyber Centre recommends that organizations: Assess the installations of SonicWall Firewalls Apply updates to SonicWall Firewalls without delay Monitor the vendor security KB for updated guidance Footnote 3 In addition, the Cyber Centre strongly recommends that organizations review and implement the Cyber Centre's Top 10 IT Security Actions Footnote 4 with an emphasis on the following strategies: Consolidate, monitor, and defend internet gateways Patch operating systems and applications Isolate web-facing applications Implement application allow lists Review the Cyber Centre's Playbook on Ransomware (ITSM.00.099) and apply recommended security controls Footnote 5 . If activity matching the content of this alert is discovered, recipients are encouraged to report via the My Cyber Portal , or email contact@cyber.gc.ca .
    After
    SonicOS: 5.9.2.14-12o and older versions, 6.5.4.14-109n and older versions, 7.0.1-5035 and older versions · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  3. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    PSIRT@sonicwall.com ↗
  4. Vendor guidanceAuthoritative vendor guidance changed: removed remediation: cyber.gc.ca/potential-ssl-vpn-zero-day-vulnerability-impacting-gen-7-sonicwall-firewalls.
    Before
    remediation: cyber.gc.ca/potential-ssl-vpn-zero-day-vulnerability-impacting-gen-7-sonicwall-firewalls · vendor advisory: psirt.global.sonicwall.com/SNWLID-2024-0015
    After
    vendor advisory: psirt.global.sonicwall.com/SNWLID-2024-0015
    PSIRT@sonicwall.com ↗
  5. Affected versionsThe structured affected or fixed version information changed.
    Before
    SonicOS: 5.9.2.14-12o and older versions, 6.5.4.14-109n and older versions, 7.0.1-5035 and older versions · Fixed: Update firmware to version 7.3.0 Reset all local user account passwords for any accounts with SSL VPN access, especially if they were carried over during migration from Gen 6 to Gen 7 Continue applying the previously recommended best practices: Enable Botnet Protection and Geo-IP Filtering Remove unused or inactive user accounts Enforce MFA and strong password policies The Cyber Centre recommends that organizations: Assess the installations of SonicWall Firewalls Apply updates to SonicWall Firewalls without delay Monitor the vendor security KB for updated guidance Footnote 3 In addition, the Cyber Centre strongly recommends that organizations review and implement the Cyber Centre's Top 10 IT Security Actions Footnote 4 with an emphasis on the following strategies: Consolidate, monitor, and defend internet gateways Patch operating systems and applications Isolate web-facing applications Implement application allow lists Review the Cyber Centre's Playbook on Ransomware (ITSM.00.099) and apply recommended security controls Footnote 5 . If activity matching the content of this alert is discovered, recipients are encouraged to report via the My Cyber Portal , or email contact@cyber.gc.ca .
    After
    SonicOS: 5.9.2.14-12o and older versions, 6.5.4.14-109n and older versions, 7.0.1-5035 and older versions · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  6. Remediation statusRemediation status changed from Patch available to Awaiting fix.
    Before
    Patch available
    After
    Awaiting fix
    PSIRT@sonicwall.com ↗
  7. Affected versionsThe structured affected or fixed version information changed.
    Before
    5.9.2.14-12o and older versions; 6.5.4.14-109n and older versions; 7.0.1-5035 and older versions · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    SonicOS: 5.9.2.14-12o and older versions, 6.5.4.14-109n and older versions, 7.0.1-5035 and older versions · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    CNA ↗
  8. Affected versionsThe structured affected or fixed version information changed.
    Before
    SonicOS: 5.9.2.14-12o and older versions, 6.5.4.14-109n and older versions, 7.0.1-5035 and older versions · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    SonicOS: 5.9.2.14-12o and older versions, 6.5.4.14-109n and older versions, 7.0.1-5035 and older versions · Fixed: Update firmware to version 7.3.0 Reset all local user account passwords for any accounts with SSL VPN access, especially if they were carried over during migration from Gen 6 to Gen 7 Continue applying the previously recommended best practices: Enable Botnet Protection and Geo-IP Filtering Remove unused or inactive user accounts Enforce MFA and strong password policies The Cyber Centre recommends that organizations: Assess the installations of SonicWall Firewalls Apply updates to SonicWall Firewalls without delay Monitor the vendor security KB for updated guidance Footnote 3 In addition, the Cyber Centre strongly recommends that organizations review and implement the Cyber Centre's Top 10 IT Security Actions Footnote 4 with an emphasis on the following strategies: Consolidate, monitor, and defend internet gateways Patch operating systems and applications Isolate web-facing applications Implement application allow lists Review the Cyber Centre's Playbook on Ransomware (ITSM.00.099) and apply recommended security controls Footnote 5 . If activity matching the content of this alert is discovered, recipients are encouraged to report via the My Cyber Portal , or email contact@cyber.gc.ca .
    Canadian Centre for Cyber Security ↗
  9. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    Canadian Centre for Cyber Security ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Added to CISA KEV
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2024-38613↗Canadian Centre for Cyber Security remediation guidance↗CISA KEV record↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2024-40766 · cve.blacktree.nl