CVE-2021-44164

Name: CVE-2021-44164
Creator: NVD / NIST
Published: 2021-12-20T03:15:06.827+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.05%

Last modified Jun 17, 2026

CVE-2021-44164 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Chain Sea ai chatbot system’s file upload function has insufficient filtering for special characters in URLs, which allows a remote attacker to by-pass file type validation, upload malicious script and execute arbitrary code without authentication, in order to take control of the system or terminate service.. EPSS estimates a 2.05% chance of exploitation in the next 30 days.

Description

Chain Sea ai chatbot system’s file upload function has insufficient filtering for special characters in URLs, which allows a remote attacker to by-pass file type validation, upload malicious script and execute arbitrary code without authentication, in order to take control of the system or terminate service.

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

2.05%

78.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Chinasea	Qb Smart Service Robot	All versions

References

https://www.twcert.org.tw/tw/cp-132-5400-c31d1-1.htmlThird Party Advisory
https://www.twcert.org.tw/tw/cp-132-5400-c31d1-1.htmlThird Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-44164?

How severe is CVE-2021-44164?

CVE-2021-44164 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.05% probability of exploitation in the next 30 days.

How do I fix CVE-2021-44164?

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-2021-44164?

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

Scan your code now

Source: NVD / NIST