SonicWall SonicOS Buffer Overflow (SNWLID-2021-0006)

high Nessus Plugin ID 150981


New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


The remote host is affected by a Buffer Overflow vulnerability, leading to partial Memory Leak.


According to its self-reported version, the remote SonicWall firewall is running a version of SonicOS that is affected by a buffer overflow vulnerability. A vulnerability in SonicOS where the HTTP server response leaks partial memory by sending a crafted unauthenticated HTTP request. This can potentially lead to an internal sensitive data disclosure vulnerability. This vulnerability affected SonicOS Gen 6 version, and, SonicOSv, and Gen 7 version 7.0.0-R713 and earlier, 7.0.1-R1036 and earlier, and below SonicOS -

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.


Upgrade to the relevant fixed version referenced in the vendor security advisory.

See Also

Plugin Details

Severity: High

ID: 150981

File Name: sonicwall_SNWLID-2021-0006.nasl

Version: 1.3

Type: combined

Family: Firewalls

Published: 6/24/2021

Updated: 6/30/2021

Dependencies: os_fingerprint.nasl

Risk Information

CVSS Score Source: CVE-2021-20019


Risk Factor: Medium

Score: 5.1


Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N

Temporal Vector: E:U/RL:OF/RC:C


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:sonicwall:sonicos

Required KB Items: Host/OS

Exploit Ease: No known exploits are available

Patch Publication Date: 6/22/2021

Vulnerability Publication Date: 6/22/2021

Reference Information

CVE: CVE-2021-20019