What is CVE-2021-44453?

CVE-2021-44453 is a critical-severity vulnerability in Myscada Mypro, classified under OS Command Injection. CVSS score: 10.0/10. Published 2021-12-23.

How severe is CVE-2021-44453?

Critical severity. CVSS v3 base score is 10.0 out of 10.

RCE in Myscada Mypro

CVE-2021-44453

mySCADA myPRO: Versions 8.20.0 and prior has a vulnerable debug interface which includes a ping utility, which may allow an attacker to inject arbitrary operating system commands.

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-12-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.014 (71.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Myscada Mypro — versions All

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

www.cisa.gov/uscert/ics/advisories/icsa-21-355-01 (US Government Resource, Third Party Advisory)

Frequently asked questions

What is CVE-2021-44453?: CVE-2021-44453 is a critical-severity vulnerability in Myscada Mypro, classified under OS Command Injection. CVSS score: 10.0/10. Published 2021-12-23.
How severe is CVE-2021-44453?: Critical severity. CVSS v3 base score is 10.0 out of 10.