SonicWall SonicOS Buffer Overflow (SNWLID-2021-0006)

high Nessus Plugin ID 150981


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: 1.4

Type: combined

Family: Firewalls

Published: 6/24/2021

Updated: 12/5/2022

Risk Information


Risk Factor: Low

Score: 3.6


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

CVSS Score Source: CVE-2021-20019


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

CEA-ID: CEA-2021-0030