What is CVE-2021-43664?

CVE-2021-43664 is a high-severity vulnerability in Totolink Ex300 V2, classified under Command Injection. CVSS score: 8.1/10. Published 2022-03-30.

How severe is CVE-2021-43664?

High severity. CVSS v3 base score is 8.1 out of 10.

RCE in Totolink Ex300 V2

CVE-2021-43664

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

Vulnerability class: Command Injection (OS Command Injection)

Published 2022-03-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (75.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 75.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: +0.000

Affected products

Totolink Ex300 V2
Totolink Ex300 V2 Firmware — versions 4.0.3c.140_b20210429

Weakness classification (CWE)

CWE-77 — Command Injection

References

github.com/chibataiki/iot-vuls/blob/main/totolink/command-injection2.md (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-43664?: CVE-2021-43664 is a high-severity vulnerability in Totolink Ex300 V2, classified under Command Injection. CVSS score: 8.1/10. Published 2022-03-30.
How severe is CVE-2021-43664?: High severity. CVSS v3 base score is 8.1 out of 10.