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Vulnerability record · CVE-2021-20031 · published 12 October 2021

CVE-2021-20031: Sonicwall sonicos open redirect vulnerability

Sonicwall · Sonicos

A Host Header Redirection vulnerability in SonicOS potentially allows a remote attacker to redirect firewall management users to arbitrary web domains.

6.1 CVSS 3.1 Medium EPSS 13% · top 3.8% CWE-601 · Open redirect
6.1CVSS 3.1 base score, v2 5.8
13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A Host Header Redirection vulnerability in SonicOS potentially allows a remote attacker to redirect firewall management users to arbitrary web domains.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/164502/Sonicwall-SonicOS-7.0-Host-Header-Injection.html ExploitThird Party AdvisoryVDB Entry
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0019 Vendor Advisory
http://packetstormsecurity.com/files/164502/Sonicwall-SonicOS-7.0-Host-Header-Injection.html ExploitThird Party AdvisoryVDB Entry
https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0019 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-53704SonicWall SonicOS SSLVPN authentication bypassSonicOS SSLVPN authentication contains an improper authentication flaw (CWE-287) that lets a remote attacker bypass authentication entirely. With a C…KEVEPSS 95%analysed9.8CVE-2024-40766SonicWall SonicOS improper access control in management accessSonicOS management access contains an improper access control flaw that can allow unauthorized resource access and, under specific conditions, crash …KEVEPSS 18%analysed9.8CVE-2020-5135SonicWall SonicOS buffer overflow in firewall request handlingSonicOS contains a classic buffer overflow (CWE-120) reachable by sending a malicious request to the firewall. It affects SonicOS Gen 6 versions 6.5.…KEVEPSS 27%analysed9.8CVE-2025-40600Sonicwall sonicos vulnerabilityUse of Externally-Controlled Format String vulnerability in the SonicOS SSL VPN interface allows a remote unauthenticated attacker to cause service d…EPSS 0.91%9.8CVE-2024-22394Sonicwall sonicos improper authentication vulnerabilityAn improper authentication vulnerability has been identified in SonicWall SonicOS SSL-VPN feature, which in specific conditions could allow a remote …EPSS 0.75%9.8CVE-2022-22274SonicOS HTTP request stack buffer overflowSonicOS and SonicOSv contain a stack-based buffer overflow reachable through an HTTP request. A remote unauthenticated attacker can trigger it to cra…EPSS 76%analysed9.8CVE-2019-12260Windriver vxworks classic buffer overflow vulnerabilityWind River VxWorks 6.9 and vx7 has a Buffer Overflow in the TCP component (issue 2 of 4). This is an IPNET security vulnerability: TCP Urgent Pointer…EPSS 23%9.8CVE-2019-12261Windriver vxworks classic buffer overflow vulnerabilityWind River VxWorks 6.7 though 6.9 and vx7 has a Buffer Overflow in the TCP component (issue 3 of 4). This is an IPNET security vulnerability: TCP Urg…EPSS 9.0%

Source: NIST National Vulnerability Database (record CVE-2021-20031), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.