CVE-2021-43555
CVE-2021-43555 is a high-severity vulnerability in Myscada Mydesigner with a CVSS 3.x base score of 7.3. Its EPSS exploit-prediction score of 38% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-22.
Key facts
- Severity: High (CVSS 3.x base score 7.3)
- CVSS v2: 6.8
- EPSS exploit prediction: 38% (99th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-22
- Affected product: Myscada Mydesigner
- Published:
- Last modified:
Description
mySCADA myDESIGNER Versions 8.20.0 and prior fails to properly validate contents of an imported project file, which may make the product vulnerable to a path traversal payload. This vulnerability may allow an attacker to plant files on the file system in arbitrary locations or overwrite existing files, resulting in remote code execution.
Frequently asked questions
- What is CVE-2021-43555?
- mySCADA myDESIGNER Versions 8.20.0 and prior fails to properly validate contents of an imported project file, which may make the product vulnerable to a path traversal payload. This vulnerability may allow an attacker to plant files on the file system in arbitrary locations or overwrite existing files, resulting in remote code execution.
- How severe is CVE-2021-43555?
- CVE-2021-43555 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity high, and availability high.
- Is CVE-2021-43555 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 38% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-43555?
- CVE-2021-43555 affects Myscada Mydesigner. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-43555?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-43555 published?
- CVE-2021-43555 was published on 2021-11-19 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:myscada:mydesigner:*:*:*:*:*:*:*:*
More vulnerabilities in Myscada Mydesigner
- CVE-2021-41578 — High (CVSS 7.8): mySCADA myDESIGNER 8.20.0 and below allows Directory Traversal attacks when importing project files. If an attacker can…
All CVEs affecting Myscada Mydesigner →
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