How severe is CVE-2021-22657?

CVE-2021-22657 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-2021-22657 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-22657?

CVE-2021-22657 affects Myscada Mypro. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-22657?

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-2021-22657 published?

CVE-2021-22657 was published on 2021-12-23 and last updated on 2026-06-17.

CVE-2021-22657

CVE-2021-22657 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% (65th 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 API password can be specified, which may allow an attacker to inject arbitrary operating system commands through a specific parameter.

Frequently asked questions

What is CVE-2021-22657?: mySCADA myPRO: Versions 8.20.0 and prior has a feature where the API password can be specified, which may allow an attacker to inject arbitrary operating system commands through a specific parameter.
How severe is CVE-2021-22657?: CVE-2021-22657 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-2021-22657 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-22657?: CVE-2021-22657 affects Myscada Mypro. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-22657?: 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-2021-22657 published?: CVE-2021-22657 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:*:*:*:*:*:*:*:*

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