CVE-2021-20019 Information disclosure in SonicOS

What is CVE-2021-20019?

CVE-2021-20019 is a high-severity vulnerability in Sonicwall Sonicos, published on 23 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in SonicOS where the HTTP server response leaks partial memory by sending a crafted HTTP request, this can potentially lead to an internal sensitive data disclosure vulnerability.

Weakness: CWE-119, CWE-200

Which versions are affected by CVE-2021-20019?

It affects 2 products.

Products include Sonicwall Sonicos, Sonicwall Sonicosv.

How do I fix CVE-2021-20019?

No fix has been published for CVE-2021-20019 yet. Limit exposure of the affected software until one is available.

Is CVE-2021-20019 being exploited?

There is no known exploitation of CVE-2021-20019 in the wild and no public exploit code.

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-32x4-2mw2-5hjv.