CVE-2021-44159

Name: CVE-2021-44159
Creator: NVD / NIST
Published: 2021-12-20T03:15:06.65+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.41%

Last modified Jun 17, 2026

CVE-2021-44159 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 4MOSAn GCB Doctor’s file upload function has improper user privilege control. A remote attacker can upload arbitrary files including webshell files without authentication and execute arbitrary code in order to perform arbitrary system operations or deny of service attack.. EPSS estimates a 3.41% chance of exploitation in the next 30 days.

Description

4MOSAn GCB Doctor’s file upload function has improper user privilege control. A remote attacker can upload arbitrary files including webshell files without authentication and execute arbitrary code in order to perform arbitrary system operations or deny of service attack.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

3.41%

87.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
4mosan	Gcb Doctor	< 2021-09-16

References

https://www.twcert.org.tw/tw/cp-132-5395-eee40-1.htmlThird Party Advisory
https://www.twcert.org.tw/tw/cp-132-5395-eee40-1.htmlThird Party Advisory

Timeline

Published: Dec 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-44159?

How severe is CVE-2021-44159?

CVE-2021-44159 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.41% probability of exploitation in the next 30 days.

How do I fix CVE-2021-44159?

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-2021-44159?

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

Scan your code now

Source: NVD / NIST