How severe is CVE-2021-43554?

CVE-2021-43554 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-43554 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43554?

CVE-2021-43554 affects Fatek Winproladder. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43554?

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-2021-43554 published?

CVE-2021-43554 was published on 2021-12-28 and last updated on 2026-06-17.

CVE-2021-43554

CVE-2021-43554 is a high-severity vulnerability in Fatek Winproladder with a CVSS 3.x base score of 7.8. 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Fatek Winproladder
Published: 2021-12-28
Last modified: 2026-06-17

Description

FATEK WinProladder Versions 3.30_24518 and prior are vulnerable to an out-of-bounds write while processing project files, which may allow an attacker to execute arbitrary code.

Frequently asked questions

What is CVE-2021-43554?: FATEK WinProladder Versions 3.30_24518 and prior are vulnerable to an out-of-bounds write while processing project files, which may allow an attacker to execute arbitrary code.
How severe is CVE-2021-43554?: CVE-2021-43554 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-43554 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43554?: CVE-2021-43554 affects Fatek Winproladder. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43554?: 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-2021-43554 published?: CVE-2021-43554 was published on 2021-12-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:fatek:winproladder:*:*:*:*:*:*:*:*

More vulnerabilities in Fatek Winproladder

CVE-2021-32992 — Critical (CVSS 9.8): FATEK Automation WinProladder Versions 3.30 and prior do not properly restrict operations within the bounds of a memory…
CVE-2021-32990 — Critical (CVSS 9.8): FATEK Automation WinProladder Versions 3.30 and prior are vulnerable to an out-of-bounds read, which may allow an…
CVE-2021-32988 — Critical (CVSS 9.8): FATEK Automation WinProladder Versions 3.30 and prior are vulnerable to an out-of-bounds write, which may allow an…
CVE-2021-43556 — High (CVSS 7.8): FATEK WinProladder Versions 3.30_24518 and prior are vulnerable to a stack-based buffer overflow while processing…
CVE-2021-38442 — High (CVSS 7.8): FATEK Automation WinProladder versions 3.30 and prior lacks proper validation of user-supplied data when parsing…
CVE-2021-38438 — High (CVSS 7.8): A use after free vulnerability in FATEK Automation WinProladder versions 3.30 and prior may be exploited when a valid…

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