CVE-2021-20027

HighCVSS 7.5/10Last modified Jun 17, 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

No affected versions have been published.

Timeline

Published
Jun 14, 2021
Last modified
Jun 17, 2026
NVD status
Modified

Related CVEs from 2021

CVE-2021-200289.8Improper neutralization of a SQL Command leading to SQL Injection vulnerability impacting end-of-life Secure Remote Access (SRA) products, sCVE-2021-20035.4Vulnerability in the Business Intelligence Enterprise Edition product of Oracle Fusion Middleware (component: Analytics Web Dashboards). SupCVE-2021-200307.5SonicWall GMS is vulnerable to file path manipulation resulting that an unauthenticated attacker can gain access to web directory containingCVE-2021-200316.1A Host Header Redirection vulnerability in SonicOS potentially allows a remote attacker to redirect firewall management users to arbitrary wCVE-2021-200329.8SonicWall Analytics 2.5 On-Prem is vulnerable to Java Debug Wire Protocol (JDWP) interface security misconfiguration vulnerability which potCVE-2021-200349.1An improper access control vulnerability in SMA100 allows a remote unauthenticated attacker to bypass the path traversal checks and delete aCVE-2021-200356.5Improper neutralization of special elements in the SMA100 management interface allows a remote authenticated attacker to inject arbitrary coCVE-2021-200377.8SonicWall Global VPN Client 4.10.5 installer (32-bit and 64-bit) incorrect default file permission vulnerability leads to privilege escalatiCVE-2021-200389.8A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthenticCVE-2021-200398.8Improper neutralization of special elements in the SMA100 management interface '/cgi-bin/viewcert' POST http method allows a remote authentiCVE-2021-20044.3Vulnerability in the Siebel Core - Server BizLogic Script product of Oracle Siebel CRM (component: Integration - Scripting). Supported versiCVE-2021-200407.5A relative path traversal vulnerability in the SMA100 upload funtion allows a remote unauthenticated attacker to upload crafted web pages or
CVE-2021-20027: High severity, CVSS 7.5 | Vulnix