How severe is CVE-2021-42110?

CVE-2021-42110 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-2021-42110 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42110?

CVE-2021-42110 affects Allegro. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42110?

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-2021-42110 published?

CVE-2021-42110 was published on 2021-12-08 and last updated on 2026-06-17.

CVE-2021-42110

CVE-2021-42110 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.

Key facts

Severity: High (CVSS 3.x base score 7.1)
CVSS v2: 6.2
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Allegro
Published: 2021-12-08
Last modified: 2026-06-17

Description

An issue was discovered in Allegro Windows (formerly Popsy Windows) before 3.3.4156.1. A standard user can escalate privileges to SYSTEM if the FTP module is installed, because of DLL hijacking.

Frequently asked questions

What is CVE-2021-42110?: An issue was discovered in Allegro Windows (formerly Popsy Windows) before 3.3.4156.1. A standard user can escalate privileges to SYSTEM if the FTP module is installed, because of DLL hijacking.
How severe is CVE-2021-42110?: CVE-2021-42110 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-2021-42110 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42110?: CVE-2021-42110 affects Allegro. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42110?: 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-2021-42110 published?: CVE-2021-42110 was published on 2021-12-08 and last updated on 2026-06-17.

References

Affected products (1)

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

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