What is CVE-2021-43989?

CVE-2021-43989 is a high-severity vulnerability in Myscada Mypro, classified under Use of Password Hash With Insufficient Computational Effort. CVSS score: 7.5/10. Published 2021-12-23.

How severe is CVE-2021-43989?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Myscada Mypro

CVE-2021-43989

mySCADA myPRO Versions 8.20.0 and prior stores passwords using MD5, which may allow an attacker to crack the previously retrieved password hashes.

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

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.007 (49.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Myscada Mypro — versions All

Weakness classification (CWE)

References

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

Frequently asked questions

What is CVE-2021-43989?: CVE-2021-43989 is a high-severity vulnerability in Myscada Mypro, classified under Use of Password Hash With Insufficient Computational Effort. CVSS score: 7.5/10. Published 2021-12-23.
How severe is CVE-2021-43989?: High severity. CVSS v3 base score is 7.5 out of 10.