CVE-2021-20046

HighCVSS 8.8/10Last modified Nov 9, 2026

Description

A Stack-based buffer overflow in the SonicOS HTTP Content-Length response header allows a remote authenticated attacker to cause Denial of Service (DoS) and potentially results in code execution in the firewall. This vulnerability affected SonicOS Gen 5, Gen 6 and Gen 7 firmware versions.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-121 CWE-787

Affected software

Vendor	Product	Versions
SonicWall	SonicOS	7.0.1-R146 and earlier; 7.0.1-5023-1349 and earlier; 7.0.1-5018-R1715 and earlier; 6.5.4.8-89n and earlier; 6.5.1.13-1n and earlier; 6.0.5.3-94o and earlier; 6.5.4.v_21s-1288 and earlier; 5.9.1.13 and earlier

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0027Vendor Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0027Vendor Advisory

Timeline

Published: Jan 10, 2022
Last modified: Nov 9, 2026
NVD status: Modified

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