CVE-2021-20027

HighCVSS 7.5/10Last modified Nov 9, 2026

Description

A buffer overflow vulnerability in SonicOS allows a remote attacker to cause a Denial of Service (DoS) by sending a specially crafted request. This vulnerability affects SonicOS Gen5, Gen6, Gen7 platforms, and SonicOSv virtual firewalls.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-120

Affected software

Vendor	Product	Versions
SonicWall	SonicOS	SonicOS 5.9.1.13 and earlier; SonicOSv 6.5.4.4 and earlier; SonicOS 6.0.5.3 and earlier; SonicOS 6.5.1.12 and earlier; SonicOS 6.5.4.7 and earlier; SonicOS 7.0.1-R1219 and earlier; SonicOS 7.0.1-R514 and earlier; SonicOS 7.0.1-R1262 and earlier

References

https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0016Mitigation, Vendor Advisory
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0016Mitigation, Vendor Advisory

Timeline

Published: Jun 14, 2021
Last modified: Nov 9, 2026
NVD status: Modified

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