What is CVE-2021-26747?

CVE-2021-26747 is a critical-severity vulnerability in Netis-Systems Wf2411, classified under OS Command Injection. CVSS score: 9.8/10. Published 2021-02-18.

How severe is CVE-2021-26747?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Netis-Systems Wf2411

CVE-2021-26747

Netis WF2780 2.3.40404 and WF2411 1.1.29629 devices allow Shell Metacharacter Injection into the ping command, leading to remote code execution.

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-02-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.548 (99.0th percentile), scored 2026-10-29.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.548 · newest: 0.548 · change: 0.000

Affected products

Netis-Systems Wf2411
Netis-Systems Wf2411 Firmware — versions 1.1.29629
Netis-Systems Wf2780
Netis-Systems Wf2780 Firmware — versions 2.3.40404

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

github.com/yhstar00/netis-route (Exploit, Third Party Advisory)
www.netis-systems.com.tw/ (Product, Vendor Advisory)

Frequently asked questions

What is CVE-2021-26747?: CVE-2021-26747 is a critical-severity vulnerability in Netis-Systems Wf2411, classified under OS Command Injection. CVSS score: 9.8/10. Published 2021-02-18.
How severe is CVE-2021-26747?: Critical severity. CVSS v3 base score is 9.8 out of 10.