CVE-2021-41243 OS Command Injection Vulnerability and Potential Zip Slip Vulnerability

What is CVE-2021-41243?

CVE-2021-41243 is a critical command injection vulnerability in Basercms Basercms, published on 26 Nov 2021. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

There is a Potential Zip Slip Vulnerability and OS Command Injection Vulnerability on the management system of baserCMS. Users with permissions to upload files may upload crafted zip files which may execute arbitrary commands on the host operating system. This is a vulnerability that needs to be addressed when the management system is used by an unspecified number of users. If you are eligible, please update to the new version as soon as possible.

Weakness: CWE-78

Which versions are affected by CVE-2021-41243?

2 open source packages ship an affected version, including baserproject/basercms. It affects 1 product.

Products include Basercms Basercms.

How do I fix CVE-2021-41243?

Upgrade baserproject/basercms to 4.5.4 or later.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2021-41243 being exploited?

There is no known exploitation of CVE-2021-41243 in the wild and no public exploit code.

Other vulnerabilities in Basercms Basercms

• CVE-2023-25654 baserCMS File Uploader Remote Code Execution (RCE) vulnerability Critical 9.8
• CVE-2023-25655 baserCMS allows any file to be uploaded Critical 9.8
• CVE-2017-10842 baserCMS SQL Injection vulnerability Critical 9.8
• CVE-2026-30880 baserCMS: OS command injection vulnerability in installer Critical 9.2
• CVE-2026-21861 baserCMS: OS Command Injection Leading to Remote Code Execution (RCE) Critical 9.1

All Basercms Basercms vulnerabilities

Sources

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

Also known as GHSA-7rpc-9m88-cf9w.