How severe is CVE-2021-43978?

CVE-2021-43978 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2021-43978 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43978?

CVE-2021-43978 affects Allegro. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43978?

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-2021-43978 published?

CVE-2021-43978 was published on 2021-12-08 and last updated on 2026-06-17.

CVE-2021-43978

CVE-2021-43978 is a high-severity vulnerability in Allegro with a CVSS 3.x base score of 7.1. 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-522.

Key facts

Severity: High (CVSS 3.x base score 7.1)
CVSS v2: 5.5
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-522
Affected product: Allegro
Published: 2021-12-08
Last modified: 2026-06-17

Description

Allegro WIndows 3.3.4152.0, embeds software administrator database credentials into its binary files, which allows users to access and modify data using the same credentials.

Frequently asked questions

What is CVE-2021-43978?: Allegro WIndows 3.3.4152.0, embeds software administrator database credentials into its binary files, which allows users to access and modify data using the same credentials.
How severe is CVE-2021-43978?: CVE-2021-43978 has a CVSS 3.x base score of 7.1, rated high severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2021-43978 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43978?: CVE-2021-43978 affects Allegro. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43978?: 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-2021-43978 published?: CVE-2021-43978 was published on 2021-12-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:allegro:allegro:3.3.4152.0:*:*:*:*:windows:*:*

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