CVE-2021-43663

Name: CVE-2021-43663
Creator: NVD / NIST
Published: 2022-03-31T00:15:08.033+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.97%

Last modified Jun 17, 2026

CVE-2021-43663 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. totolink EX300_v2 V4.0.3c.140_B20210429 was discovered to contain a command injection vulnerability via the component cloudupdate_check.. EPSS estimates a 0.97% chance of exploitation in the next 30 days.

Description

totolink EX300_v2 V4.0.3c.140_B20210429 was discovered to contain a command injection vulnerability via the component cloudupdate_check.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.97%

57.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-77

Affected Software

Vendor	Product	Versions
Totolink	Ex300 V2 Firmware	4.0.3c.140_b20210429

References

https://github.com/chibataiki/iot-vuls/blob/main/totolink/command-injection1.mdExploit, Third Party Advisory
https://github.com/chibataiki/iot-vuls/blob/main/totolink/command-injection1.mdExploit, Third Party Advisory

Timeline

Published: Mar 31, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43663?

totolink EX300_v2 V4.0.3c.140_B20210429 was discovered to contain a command injection vulnerability via the component cloudupdate_check.

How severe is CVE-2021-43663?

CVE-2021-43663 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.97% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43663?

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-2021-43663?

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

Scan your code now

Source: NVD / NIST