CVE-2021-20031 Open redirect in SonicOS

What is CVE-2021-20031?

CVE-2021-20031 is a medium-severity vulnerability in Sonicwall Sonicos, published on 12 Oct 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

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

Weakness: CWE-601

Which versions are affected by CVE-2021-20031?

It affects 1 product.

Products include Sonicwall Sonicos.

How do I fix CVE-2021-20031?

No fix has been published for CVE-2021-20031 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-20031 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-20031 exists.

Public exploit code: 1 Exploit-DB entry and 1 Nuclei template.

Other vulnerabilities in Sonicwall Sonicos

• CVE-2020-5135 SonicWall SonicOS Buffer Overflow Exploited Critical 9.8
• CVE-2024-40766 SonicWall SonicOS Improper Access Control Exploited Critical 9.3
• CVE-2024-53704 SonicWall SonicOS SSLVPN Improper Authentication Exploited High 8.2
• CVE-2025-40600 Denial of service in SonicOS Critical 9.8
• CVE-2024-22394 Auth bypass in SonicOS Critical 9.8

All Sonicwall Sonicos vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-467c-cx8x-xprw.