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Security Advisory: SonicOS Vulnerability In Firewall Web Management Interface


SonicWall physical and virtual firewalls running certain versions of SonicOS may contain a vulnerability that could be leveraged for an unauthenticated Denial-of-Service (DoS) attack by sending a specially crafted POST request to the web interface.  

At this time, there is no indication that the discovered vulnerability is being exploited in the wild.

SonicWall STRONGLY advises customers to apply the respective SonicOS patch immediately. See below for specific SonicOS versions.


The vulnerability requires Web Management to be enabled on the WAN/LAN interface and requires the precondition of an ongoing active management session. For example, an administrator is logged into the web interface or Global Management System (GMS) / Network Security Manager (NSM) are configured to manage the firewall over HTTPS on the WAN interface.

Other GMS/NSM management modes, enumerated below, are not impacted while WAN management is disabled on the firewall.

The SSL-VPN portal on the firewall, Virtual Office, is NOT affected.

Implementation Impact
GMS IPSec tunnel mode Not Impacted
GMS Existing VPN tunnel mode Not Impacted
GMS Zero Touch Not Impacted
NSM Zero Touch Not Impacted
GMS Management (Zero Touch Mode) Not Impacted
NSM Management (Zero Touch Mode) Not Impacted


Updating SonicOS Firmware (Recommended)

After reviewing this security advisory, please go to MySonicWall and download the appropriate SonicOS patch release from the table below. The following article provides information on “How to Update SonicOS Firmware.”


Until the below patches can be applied, SonicWall strongly recommends that administrators limit SonicOS management access to trusted sources (and/or disable management access from untrusted internet sources) by modifying the existing SonicOS Management access rules (SSH/HTTPS/HTTP Management). This will only allow management access from trusted source IP addresses.

Please refer to the following knowledgebase articles:

In addition, it is a recommended practice to update the default management port to a custom port to prevent attacks on well-known ports.


In the table below, find the existing SonicOS version that a firewall is currently running (SonicOS Running Version). Select the SonicOS patch release from the same row, download that version from MySonicWall, and update the SonicOS firmware using the steps linked above.

Platforms SonicOS Running Version  SonicOS Patch Release (Update to version or later) 
TZ, NSa (GEN7) 7.0.1-R1262 and older 7.0.1-R1456
NSv (Virtual GEN7) 7.0.1-R1219 and older  7.0.1-R1282/1283
NSsp (GEN7) 7.0.1-R514 and older 7.0.1-R579
NSa, TZ, SOHO W, SuperMassive 92xx/94xx/96xx (GEN6+) and older
NSv (Virtual: VMWare/Hyper-V/AWS/Azure/KVM) All versions (virtual) 6.5.4.v_21s-1288
NSsp 12K, SuperMassive 9800 and older
SuperMassive 10K and older TBD/Pending
NSA, TZ, SOHO (GEN5) and older TBD/Pending

SonicWall has provided patches for recent major and minor releases, as shown in the table above. For devices with hotfixes or language-specific releases, please follow the instructions above to restrict SonicWall management access (HTTPS/HTTP/SSH) to trusted sources and/or disable management access from untrusted internet sources. Once complete, coordinate with SonicWall support to select the appropriate patch with the hotfix.

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