CVE-2021-41243

Name: CVE-2021-41243
Creator: NVD / NIST
Published: 2021-11-26T18:15:07.253+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 2.17%

Last modified Jun 17, 2026

CVE-2021-41243 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 2.17% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

2.17%

80.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Basercms	Basercms	< 4.5.4

References

https://github.com/baserproject/basercms/commit/9088b99c329d1faff3a2f1269f37b9a9d8d5f6ffPatch, Third Party Advisory
https://github.com/baserproject/basercms/security/advisories/GHSA-7rpc-9m88-cf9wThird Party Advisory
https://github.com/baserproject/basercms/commit/9088b99c329d1faff3a2f1269f37b9a9d8d5f6ffPatch, Third Party Advisory
https://github.com/baserproject/basercms/security/advisories/GHSA-7rpc-9m88-cf9wThird Party Advisory

Timeline

Published: Nov 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41243?

How severe is CVE-2021-41243?

CVE-2021-41243 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.17% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41243?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-41243?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST