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CVE-2021-20039

8.8 · HIGH

Improper neutralization of special elements in the SMA100 management interface '/cgi-bin/viewcert' POST http method allows a remote authenticated attacker to inject arbitrary commands as a 'nobody'…

Published Dec 8, 2021CWE-78EPSS 78.75%

Overview

CVE-2021-20039 is a high-severity vulnerability. It was published on December 8, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Improper neutralization of special elements in the SMA100 management interface '/cgi-bin/viewcert' POST http method allows a remote authenticated attacker to inject arbitrary commands as a 'nobody' user. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refpacketstormsecurity.com/files/165563/SonicWall-SMA-100-Series-Authenticated-Command-Injection.htmlRefpsirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026Refpacketstormsecurity.com/files/165563/SonicWall-SMA-100-Series-Authenticated-Command-Injection.htmlRefpsirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026Refattackerkb.com/topics/9szJhq46lw/cve-2021-20039/rapid7-analysis

How CyberStrike helps

Frequently asked questions

What is CVE-2021-20039?

CVE-2021-20039 is a high-severity vulnerability. It was published on December 8, 2021 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2021-20039?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-20039?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-20039?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-20039 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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