How severe is CVE-2021-43984?

CVE-2021-43984 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-43984 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43984?

CVE-2021-43984 affects Myscada Mypro. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43984?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-43984 published?

CVE-2021-43984 was published on 2021-12-23 and last updated on 2026-06-17.

CVE-2021-43984

CVE-2021-43984 is a critical-severity vulnerability in Myscada Mypro with a CVSS 3.x base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
CVSS v2: 7.5
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Myscada Mypro
Published: 2021-12-23
Last modified: 2026-06-17

Description

mySCADA myPRO: Versions 8.20.0 and prior has a feature where the firmware can be updated, which may allow an attacker to inject arbitrary operating system commands through a specific parameter.

Frequently asked questions

What is CVE-2021-43984?: mySCADA myPRO: Versions 8.20.0 and prior has a feature where the firmware can be updated, which may allow an attacker to inject arbitrary operating system commands through a specific parameter.
How severe is CVE-2021-43984?: CVE-2021-43984 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-43984 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43984?: CVE-2021-43984 affects Myscada Mypro. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43984?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-43984 published?: CVE-2021-43984 was published on 2021-12-23 and last updated on 2026-06-17.

References

https://www.cisa.gov/uscert/ics/advisories/icsa-21-355-01

Affected products (1)

cpe:2.3:a:myscada:mypro:*:*:*:*:*:*:*:*

More vulnerabilities in Myscada Mypro

CVE-2025-24865 — Critical (CVSS 10.0): The administrative web interface of mySCADA myPRO Manager can be accessed without authentication which could allow…
CVE-2021-44453 — Critical (CVSS 10.0): mySCADA myPRO: Versions 8.20.0 and prior has a vulnerable debug interface which includes a ping utility, which may…
CVE-2021-43981 — Critical (CVSS 10.0): mySCADA myPRO: Versions 8.20.0 and prior has a feature to send emails, which may allow an attacker to inject arbitrary…
CVE-2021-23198 — Critical (CVSS 10.0): mySCADA myPRO: Versions 8.20.0 and prior has a feature where the password can be specified, which may allow an attacker…
CVE-2021-22657 — Critical (CVSS 10.0): mySCADA myPRO: Versions 8.20.0 and prior has a feature where the API password can be specified, which may allow an…
CVE-2022-2234 — Critical (CVSS 9.9): An authenticated mySCADA myPRO 8.26.0 user may be able to modify parameters to run commands directly in the operating…

All CVEs affecting Myscada Mypro →

Other CWE-78 (OS Command Injection) vulnerabilities

CVE-2026-100382 — Critical (CVSS 10.0): Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in Wikimedia…
CVE-2026-77521 — Critical (CVSS 10.0): MaxKB is an open-source AI assistant for enterprise. Prior to version 2.10.5-lts, assistants with a tool, MCP tool,…
CVE-2026-82004 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) is affected by an Improper Neutralization of Special Elements used in an OS Command ('OS…
CVE-2026-76197 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) is affected by an Improper Neutralization of Special Elements used in an OS Command ('OS…
CVE-2026-76195 — Critical (CVSS 10.0): Adobe Campaign Classic (ACC) is affected by an Improper Neutralization of Special Elements used in an OS Command ('OS…
CVE-2026-19188 — Critical (CVSS 10.0): A critical OS command injection vulnerability has been identified in the Haiwell IoT Cloud HMI Gateway product. The…

Browse all CWE-78 (OS Command Injection) vulnerabilities →